Born: 15 April 1809 in Stettin, Prussia (now Szczecin, Poland)

Died: 26 September 1877 in Stettin, Germany (now Szczecin, Poland)

Hermann Grassmann's father was Justus Günter Grassmann and his mother was Johanne Luise Friederike Medenwald, who was the daughter of a minister from Klein-Schönfeld. Justus had been ordained a minister but he had taken a position in the Gymnasium at Stettin as a teacher of mathematics and physics. He was a fine academic who wrote several school books on physics and mathematics, and also undertook research on crystallography. Johanne and Justus had twelve children, Hermann being their third child. Hermann's brother Robert also became a mathematician and the two collaborated on many projects.

When Hermann was young he was taught by his mother, who was a well educated woman. He then attended a private school before entering the Gymnasium in Stettin where his father taught. Most of the mathematicians in this archive impressed their teachers from a young age, but surprisingly, despite having excellent educational opportunities in an educationally minded family, Hermann did not excel during his first few years at the Gymnasium. His father felt that he should aim at a manual job such as a gardener or a craftsman. Hermann did find pleasure in music and learnt to play the piano. As he progressed through the school he did slowly improve and by the time he took his final secondary school examinations at the age of eighteen, he was ranked second in the school. Having proved himself at least a very competent scholar, Hermann decided that he would study theology, and he went to Berlin in 1827 with his eldest brother to study at the University of Berlin. He took courses on theology, classical languages, philosophy, and literature but does not appear to have taken any courses on mathematics or physics.

Although he seems to have had no formal university training in mathematics, it was this topic which interested him on his return to Stettin in the autumn of 1830 after completing his university studies in Berlin. Clearly his father's influence was important in taking him in that direction, and he decided at this time that he would become a school teacher but he was determined to undertake mathematical research on his own. After a year undertaking research in mathematics and preparing himself to take the examinations to teach in gymnasiums, he went to Berlin in December 1831 to take the necessary examinations. His papers could not have been of a good standard, since his examiners only gave him at a pass to teach at the lower levels of a gymnasium. He was told that before he could teach at higher levels he would need to retake the examinations and show a much greater knowledge of the subjects for which he had presented himself. In the spring of 1832 he was appointed to the Gymnasium at Stettin as an assistant teacher.

It was about this time that he made his first significant mathematical discoveries which were to lead him to the important ideas he would develop a few years later. In the Foreword of his Die Lineale Ausdehnungslehre, ein neuer Zweig der Mathematik (Linear Extension Theory, a new branch of mathematics) (1844) Grassmann described how he was led to these ideas starting around 1832.

In 1834 Grassmann took the theology examinations, at level one, set by the Lutheran Church Council of Stettin but although this might have been his first step towards becoming a minister in the Lutheran Church, instead he went to Berlin in the autumn of that year to take up an appointment as a mathematics teacher at the Gewerbeschule. The vacancy had occurred since the previous teacher, Jacob Steiner, had just been appointed to a mathematics chair at the University of Berlin. Grassmann only spent a year at the Gewerbeschule before a new opportunity arose back in his home town of Stettin. A new school, the Otto Schule, had just opened and Grassmann was appointed to teach mathematics, physics, German, Latin, and religious studies. He had only qualified to teach at a low level, and this explains to some extent the wide range of topics he taught.

Over the next four years Grassmann took his teaching very seriously, yet he was able to find time to devote to mathematical research as well as concentrating on preparing himself for further examinations. In 1839 he passed the theology examinations, at level two, set by the Lutheran Church Council of Stettin, and in 1840 he went to Berlin to take examinations which would allow him to teach certain subjects at the highest gymnasium level. From then on he was able to teach mathematics, physics, chemistry and mineralogy at all secondary school levels.

In fact the examinations that Grassmann took in 1840 were significant for him in another way. He had to submit an essay on the theory of the tides as part of the examination. He took the basic theory from Laplace's Méchanique céleste and from Lagrange's Méchanique analytique but he realised that he was able to apply the vector methods which he had been developing since 1832 (described in the preface to Die Lineale Ausdehnungslehre) to produce an original and simplified approach. His essay Theorie der Ebbe und Flut was 200 pages long and introduced for the first time an analysis based on vectors, including vector addition and subtraction, vector differentiation, and vector function theory. Although his essay was accepted by the examiners they totally failed to see the importance of the innovations which Grassmann had introduced. On the other hand it had shown Grassmann that his theory was widely applicable and he decided to spend as much time as he could spare on further developing his ideas on vector spaces.

Of course Grassmann could not devote too much time to research since he was a dedicated teacher who wanted to put considerable effort into doing that job to the very best of his ability. He wrote a number of textbooks, two of which were published in 1842: one was on spoken German, the other on Latin. After writing these textbooks, he turned his full attention to writing Die lineale Ausdehnungslehre, ein neuer Zweig der Mathematik. He started in the spring of 1842 and by the autumn of 1843 he had completed the manuscript. It was published in the following year. In this work, which must be considered as a masterpiece of originality, he developed the idea of an algebra in which the symbols representing geometric entities such as points, lines and planes, are manipulated using certain rules. He represented subspaces of a space by coordinates leading to point mapping of an algebraic manifold now called the Grassmannian.

Fearnley-Sander writes in [27] about the vector methods which Grassmann set out in this work and then refined further in 1862:-

Beginning with a collection of ''units'' e₁, e₂ , e₃ , ... he effectively defines the free linear space which they generate; that is to say, he considers formal linear combinations a₁e₁ + a₂e₂ + a₃e₃ + ... where the a_j are real numbers, defines addition and multiplication by real numbers [in what is now the usual way] and formally proves the linear space properties for these operations. ... He then develops the theory of linear independence in a way which is astonishingly similar to the presentation one finds in modern linear algebra texts.

He defines the notions of subspace, independence, span, dimension, join and meet of subspaces, and projections of elements onto subspaces. He is aware of the need to prove invariance of dimension under change of basis, and does so. He proves the Steinitz Exchange Theorem, named for the man who published it in 1913 ... Among other such results, he shows that any finite set has an independent subset with the same span and that any independent set extends to a basis, and he proves the important identity

dim(U + W) = dim U + dimW - dim (U ∩ W).

He obtains the formula for change of coordinates under change of basis, defines elementary transformations of bases, and shows that every change of basis (equivalently, in modern terms, every invertible linear transformation) is a product of elementaries.

Grassmann also realised that once geometry is put into this algebraic form then the apparent restrictions of 3-dimensional space vanish. Grassmann wrote in the Ausdehnungslehre of 1844:-

If two different rules of change are applied, then the collection of elements produced... forms a system of the second step.... If still a third independent rule is added, then a system of the third step is attained, and so forth. Space theory may serve here as an example.... The plane is the system of the second step.... If one adds a third independent direction, then the whole infinite space (system of the third step) is produced.... One cannot here go further than up to three independent directions (rules of change), while in the pure theory of extension their quantity can increase up to infinity.

Grassmann invented what is now called exterior algebra. This was joined to Hamilton's quaternions by Clifford in 1878. Clifford replaced Grassmann's rules

e_p∧e_p = 0 and e_p∧e_q = -e_q∧e_p for p not q

by the rules

e_p e_p = 1 and e_p e_q = -e_q e_p for p not q.

Clifford algebras are used today in the theory of quadratic forms and in relativistic quantum mechanics. Clifford algebras appear together with Grassmann's exterior algebra in differential geometry. See [66].

What did mathematicians make of this revolutionary text? Sadly it was far too much ahead of its time to be appreciated. Möbius did not understand the significance of Grassmann's approach and declined to write a review. As a consequence the book was largely ignored. Grassmann, however, went on to apply his new concepts to other situations, feeling that once people saw how the theory could be applied they would take it seriously. He published Neue Theorie der Elektrodynamik in 1845 and wrote various papers with applications to algebraic curves and surfaces over the next ten years. He received most recognition for a work he produced in 1846. Möbius suggested that he enter for the prize proposed by the Fürstliche Jablonowski'schen Gesellschaft for entries which solved a problem, first proposed by Leibniz, to establish geometric characteristic without using metric properties. Grassmann submitted Die Geometrische Analyse geknüpft und die von Leibniz Characteristik which received the award on 1 July 1846. However, it was not all good news for Grassmann since his was the only entry and Möbius, who was one of the judges, criticised the way that Grassmann introduced abstract ideas without providing the reader with an intuitive hook on which to hang them.

Grassmann felt somewhat aggrieved that he was producing highly innovative mathematics which he felt was important yet he was still teaching in secondary schools. In fact although he had been in Stettin since first appointed to the Otto Schule, he had been moved first to the Stettin Gymnasium, then to the Friedrich Wilhelm Schule due to educational reorganisation in the town. In May 1847 he received the title Oberlehrer at the Friedrich Wilhelm Schule and in the same month he wrote to the Prussian Ministry of Education requesting that he be put on a list of those to be considered for university positions. The Ministry of Education asked Kummer for his opinion of Grassmann who read his prize winning essay Geometrische Analyse and reported that it contained:-

... commendably good material expressed in a deficient form.

Kummer's report ended any hopes that Grassmann might have had to obtain a university post. It is interesting to see just how many leading mathematicians failed to recognise that the mathematics Grassmann presented would become the basic foundation of the subject in 100 years time.

The years 1848-49 were marked by revolutions. The overthrow of King Louis-Philippe of France in February 1848 was the signal for revolutions in the German Confederation. Moves were made towards political unification of Germany but bitter disputes followed as to the way the country should be governed. During this revolutionary period of 1848-49 Grassmann, together with his brother Robert, published a political weekly newspaper. Their political position was one of pressing for the unification of Germany as a constitutional monarchy. After writing a series of articles on constitutional law, Grassmann became increasingly at odds with the political direction the newspaper was going and withdrew form it.

Earlier in 1849 he had married Therese Knappe, the daughter of a landowner, on 12 April. They had eleven children of whom seven reached adulthood. One of their sons, Hermann Ernst Grassmann, received a doctorate in 1893 for his thesis Anwendung der Ausdehnungslehre auf die Allgemeine Theorie der Raumkurven und Krummen Flächen written under Albert Wangerin's supervision at the University of Halle-Wittenberg. He went on to become professor of mathematics at the University of Giessen.

In March 1852 Grassmann's father Justus died and later that year Grassmann was appointed to fill his father's former position at Stettin Gymnasium. This meant that, although still teaching in a secondary school, he now had the title of professor. It is worth noting that two of Grassmann's sons, Justus and Max, eventually became teachers at Stettin Gymnasium. Having failed to gain recognition for his mathematics, Grassmann turned to one of his other favourite subjects, the study of Sanskrit and Gothic. In fact during his life it is fair to say that he gained more recognition for his study of languages:-

By demonstrating that Germanic actually was "older" in one phonological pattern than was Sanskrit, Grassmann undermined the position of Sanskrit as the language which was the earliest attainable in Indo-European linguistics. By this demonstration Grassmann also undermined the notion that language developed from an analytic to a synthetic structure through [combining simple words without changing their form to make new words].

But Grassmann also studied problems in physics, in particular publishing a theory of the mixing of colours in 1853 which contradicted that proposed by Helmholtz. By the middle of the following year, however, he had returned to mathematics and his theory of extension deciding that rather than write a second volume, as he had originally intended, he would completely rewrite the work in an attempt to have its significance recognised. In fact, despite writing a work which appears to us today to be in the style of a modern textbook, Grassmann failed to convince mathematicians of his own time. Perhaps he was just so assured of the importance of the topic that he could not bring himself to set out to sell it to sceptical readers. Certainly the book Die Ausdehnungslehre: Vollständig und in strenger Form bearbeitet published by Grassmann in 1862 fared no better that the first version of 1844.

Disappointed that he could not convince mathematicians, he turned again to research in linguistics. Here he did indeed fare much better and he was honoured for his contributions to this area of scholarship by being elected to the American Oriental Society, and with the award of an honorary degree by the University of Tübingen. He did return to mathematics in the last couple of years of his life and, despite failing health, prepared another edition of the 1844 Ausdehnungslehre for publication. It did appear, but only after his death. Grassmann died of heart problems after a period of slowly failing health.

Grassmann's mathematical methods were slow to be adopted but eventually they inspired the work of Élie Cartan and have since been used in studying differential forms and their application to analysis and geometry. Other who were directly influenced included Hankel, Peano, Whitehead, and Klein. Much of Peano's contributions were, as he acknowledges himself, based on the ideas of Grassmann. As A C Lewis writes:-

It seems to be Grassmann's fate to be rediscovered from time to time, each time as if he had been virtually forgotten since his death in 1879.

Fearnley-Sander writes in [27]:-

1. W Burau, C J Scriba, Biography in Dictionary of Scientific Biography (New York 1970-1990). 
   http://www.encyclopedia.com/doc/1G2-2830901716.html
2. Biography in Encyclopaedia Britannica. 
   http://www.britannica.com/eb/article-9037770/Hermann-Gunther-Grassmann

Books:

1. H-J Petsche, Grassmann (Basel, 2006)
2. H-J Petsche: Hermann Grassmann - Biography. Transl. by M Minnes. (Basel, 2009)
3. H-J Petsche, L Kannenberg, G Kessler and J Liskowacka (eds.): Hermann Grassmann -- Roots and Traces. Autographs and Unknown Documents. Text in German and English. (Basel, 2009)
4. H-J Petsche and P Lenke (eds.): International Grassmann Conference. Hermann Grassmann Bicentennial: Potsdam and Szczecin, 16 - 19 September 2009; Video Recording of the Conference. 4 DVD's, 16:59:25. (Potsdam, 2010)
5. H-J Petsche, A C Lewis, J Liesen and S Russ (eds.): From Past to Future: Grassmann's Work in Context. The Grassmann Bicentennial Conference, September 2009 (Basel, 2010)
6. P Schreiber (ed.), Hermann Grassmann : Werk und Wirkung, Proceedings of the International Conference on the Occasion of the One Hundred and Fiftieth Anniversary of the First Publication of the Lineale Ausdehnungslehre, held in Lieschow, May 23-28, 1994 (Greifswald, 1995).
7. G Schubring (ed.), Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996).

Articles:

1. A Beutelspacher, A survey of Grassmann's 'Lineale Ausdehnungslehre', in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 3-6.
2. B Biryukov and Z Kuzicheva, On the early appraisals in Russia of H. and R. Grassmann's achievements, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 175-183
3. L G Biryukova, The problem of the meaning of an analytic operation in H Grassmann's 'Die allgemeine Formenlehre' (Russian), Istor. Metodol. Estestv. Nauk No. 32 (1986), 66-74.
4. L G Biryukova and B V Biryukov, On the axiomatic sources of fundamental algebraic structures: the achievements of Hermann Grassmann and Robert Grassmann (Russian), Modern Logic 7 (2) (1997), 131-159.
5. L G Biryukova and B V Biryukov, Algorithmic problems in the 20th century and the formation of axiomatics of fundamental algebraic structures : the contribution of Hermann and Robert Grassmann (Russian), in Methodological analysis of the foundations of mathematics (Russian) ('Nauka', Moscow, 1988), 164-173.
6. L G Biryukova, Brief outline of a history of the genetic method in the development of the deductive sciences, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 87-90
7. A Brigaglia, The influence of H Grassmann on Italian projective n-dimensional geometry, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 155-163.
8. A Brini and A G B Teolis, Grassmann progressive and regressive products and CG-algebras, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 231-242.
9. J Browne, Grassmann, geometry and mechanics, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 287-302
10. P Cantù, Grassmann's epistemology: multiplication and constructivism, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 91-100
11. G Châtelet, La capture de l'extension comme dialectique géométrique: dimension et puissance selon l'Ausdehnung de Grassmann (1844), in 1830-1930 : a century of geometry (Berlin, 1992), 222-244.
12. H Crapo, On Grassmann's regressive product, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 261-274
13. F Demonte-Barbera, Did Gibbs influence Peano's ''Calcolo geometrico secondo l'Ausdehnungslehre di H. Grassmann ...'' ? in From Past to Future: Grassmann's Work in Context (Basel, 2010), 197-208
14. J Dieudonné, The tragedy of Grassmann, Linear and Multilinear Algebra 8 (1) (1979/80), 1-14.
15. J-L Dorier, Basis and dimension---from Grassmann to van der Waerden, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 175-196.
16. J Echeverr’a, L'analyse géométrique de Grassmann et ses rapports avec la caractéristique géométrique de Leibniz, Studia Leibnitiana 11 (2) (1979), 223-273.
17. K Elfering, Über die sprachwissenschaftlichen Forschungen und das Aspiratengesetz von Hermann Günther Grassmann, in Hermann Grassmann : Werk und Wirkung (Greifswald, 1995), 33-36.
18. D Fearnley-Sander, Hermann Grassmann and the creation of linear algebra, Amer. Math. Monthly 86 (10) (1979), 809-817.
19. D Fearnley-Sander, Hermann Grassmann and the prehistory of universal algebra, Amer. Math. Monthly 89 (3) (1982), 161-166.
20. D Fearnley-Sander, Grassmann's theory of dimension, in First Australian Conference on the History of Mathematics (Clayton, 1981), 52-82.
21. D Flament, La 'Lineale Ausdehnungslehre' (1844) de Hermann Günther Grassmann, in 1830-1930 : a century of geometry (Berlin, 1992), 205-221.
22. O I Franksen, Invariance under nesting---an aspect of array-based logic with relation to Grassmann and Peirce, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 303-335.
23. P Freguglia, Hermann Grassmann's Work and the Peano School, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 185-195
24. N A Gordienko, The concept of 'fraction' in H Grassmann's 'Die Ausdehnungslehre' and its connection with contemporary linear algebra (Russian), Istor.-Mat. Issled. (32-33) (1990), 181-199.
25. T Goto, The RigvedaDictionary froma modern viewpoint, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 363-375
26. I Grattan-Guinness, Discovering Robert Grassmann (1815--1901), in From Past to Future: Grassmann's Work in Context (Basel, 2010), 19-35.
27. I Grattan-Guinness, Where does Grassmann fit in the history of logic?, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 211-216.
28. J Hafner, Hermann Grassmann's theory of religion and faith, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 37-47.
29. M Hartimo, Grassmann's influence on Husserl, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 149-159
30. A E Heath, Hermann Grassmann, The neglect of his work, Monist 27 (1917), 1-56.
31. D Hestenes, Grassmann's legacy, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 243-260
32. D Hestenes, Grassmann's vision, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 243-254.
33. M-L Heuser, The Significance of Naturphilosophie for Justus and Hermann Grassmann, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 49-59
34. D Hildenbrand, From Grassmann's vision to geometric algebra computing, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 423-433
35. E Hitzer, New views of crystal symmetry guided by profound admiration of the extraordinary works of Grassmann and Clifford, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 413-422
36. M E Horn, Grassmann, Pauli, Dirac: special relativity in the schoolroom, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 435-450
37. M Kozianka, Grassmann's ''Wörterbuch des Rig-Veda'' (Dictionary of Rig-Veda): a milestone in the study of Vedic Sanskrit, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 353-361
38. F D Kramar, The geometrical algebra of Saint-Venant, Grassmann, Hamilton (Russian), in Proc. Second Kazakhstan Interuniv. Sci. Conf. Math. Mech. 1965 (Russian) (Izdat. 'Nauka' Kazah. SSR, Alma-Ata, 1968 ), 236--237.
39. F D Kramar, The geometric Grassmann calculus (Russian), in Proc. Second Kazakhstan Interuniv. Sci. Conf. Math. Mech. 1965 (Russian) (Izdat. 'Nauka' Kazah. SSR, Alma-Ata, 1968 ), 30-33.
40. Th Krisch, Ch Katsikadeli and S Niederreiter, Grassmann's contribution to lexicography and the living-on of his ideas in the Salzburg Dictionary to the Rig-Veda, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 377-386
41. F W Lawvere, Grassmann's dialectics and category theory, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 255-264.
42. A C Lewis, Some philosophical influences of the Ausdehnungslehre, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 141-148
43. H Li, Projective geometric theorem proving with Grassmann - Cayley algebra, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 275-285
44. J Liesen, Hermann Grassmann's theory of linear transformations, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 311-323
45. A C Lewis, The influence of Grassmann's theory of tides on the 'Ausdehnungslehre', in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 29-35.
46. A C Lewis, H Grassmann's 1844 'Ausdehnungslehre' and Schleiermacher's 'Dialektik', Ann. of Sci. 34 (2) (1977), 103-162.
47. A C Lewis, Hermann Grassmann and the algebraization of arithmetic, in Hermann Grassmann : Werk und Wirkung (Ernst-Moritz-Arndt-Universität, Greifswald, Greifswald, 1995), 47-58.
48. A C Lewis, The unity of logic, pedagogy and foundations in Grassmann's mathematical work, Hist. Philos. Logic 25 (1) (2004), 15-36.
49. P Lounesto Clifford Algebras and Spinors (Cambridge, 1997), 33-49.
50. G I R Malykhina, Grassmann's 'Forms of rigorous science' and their relation to natural language (Russian), Vestnik Beloruss. Gos. Univ. Ser. I (1) (1981), 72-73.
51. N Marchuk, Representations of spinor groups using Grassmann exterior algebra, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 303-309
52. G Mazzola, Classification of complex musical structures by Grassmann schemes, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 401-412
53. Z Nádeník, Reception of Grassmann's ideas in Bohemia, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 147-153.
54. J J Ohala, Hermann Grassmann: his contributions to historical linguistics and speech acoustics, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 345-352
55. M Otte, Justus and Hermann Grassmann: philosophy andmathematics, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 61-70
56. M Otte, The ideas of Hermann Grassmann in the Context of the Mathematical and Philosophical Tradition since Leibniz, Historia Mathematica 16 (1989), 1-35.
57. M Otte, Gleichheit und Gegenständlichkeit in der Begründung der Mathematik im 19. Jahrhundert - dargestellt am Beispiel der Auffassungen von H Grassmann, B Bolzano und G Frege, in Konzepte des mathematisch Unendlichen im 19. Jahrhundert (Göttingen, 1990), 219-253.
58. V Peckhaus, The influence of Hermann Günther Grassmann and Robert Grassmann on Ernst Schröder's algebra of logic, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 217-227.
59. V Peckhaus, Robert and Hermann Grassmann's influence on the history of formal logic, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 221-228
60. H-J Petsche, It began with Pestalozzi and Schleiermacher. Reflections on the polymath Hermann Grassmann (1809 -- 1877), Newsletter of the European Mathematical Society , No. 76 (June 2010), 39-46.
61. H-J Petsche, Ernst Abbe's reception of Grassmann in the light of Grassmann's reception of Schleiermacher. in From Past to Future: Grassmann's Work in Context. (Basel, 2010), 161-174
62. J Pfalzgraf, A short note on Grassmann manifolds with a view to noncommutative geometry, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 333-341
63. M Radu, Axiomatics and self-reference: Reflections about Hermann Grassmann's contribution to axiomatics, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 101-116
64. K Reich, Über die Ehrenpromotion Hermann Grassmanns an der Universität Tübingen im Jahre 1876, in Hermann Grassmann : Werk und Wirkung (Greifswald, 1995), 59-63.
65. K Reich, Rudolf Mehmke, an outstanding propagator of Grassmann's vector calculus, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 209-220
66. J Riche, Hermann Grassmann's contribution to Whitehead's foundations of logic and mathematics, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 229-239
67. D E Rowe, On the reception of Grassmann's work in Germany during the 1870's, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 131-145.
68. S Russ, Concepts and contrasts: Hermann Grassmann and Bernard Bolzano, in From Past to Future: Grassmann's Work in Context (Basel, 2010), 117-126
69. G Sarton, Grassmann - 1844, Isis 35 (1945), 326-330.
70. K-H Schlote, Hermann Günther Grassmann and the theory of hypercomplex number systems, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 165-173.
71. K-H Schlote, Hermann Grassmanns Beitrag zur Algebrentheorie, Janus 72 (4) (1985), 225-255.
72. K-H Schlote, Hypercomplex numbers in the work of Caspar Wessel and Hermann Günther Grassmann: are there any similarities?, Mat. Medd. Danske Vid. Selsk. 46 (2) (2001), 205-222.
73. E Scholz, The influence of Justus Grassmann's crystallographic works on Hermann Grassmann, in Hermann Günther Grassmann (1809-1877) : visionary mathematician, scientist and neohumanist scholar (Dordrecht, 1996), 37-45.
74. E Scholz, Hermann Grassmanns Analysis in Vektorräumen, Math. Semesterber. 31 (2) (1984), 177-194.
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