Read More
Date: 31-5-2021
1973
Date: 8-7-2021
1581
Date: 25-7-2021
2118
|
A diagram lemma which states that, given the above commutative diagram with exact rows, the following holds:
1. If is surjective, and and are injective, then is injective;
2. If is injective, and and are surjective, then is surjective.
This lemma is closely related to the five lemma, which is based on a similar diagram obtained by adding a single column.
REFERENCES:
Mac Lane, S. Homology. Berlin: Springer-Verlag, p. 364, 1967.
|
|
"عادة ليلية" قد تكون المفتاح للوقاية من الخرف
|
|
|
|
|
ممتص الصدمات: طريقة عمله وأهميته وأبرز علامات تلفه
|
|
|
|
|
ضمن أسبوع الإرشاد النفسي.. جامعة العميد تُقيم أنشطةً ثقافية وتطويرية لطلبتها
|
|
|