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May
17
revised prove $p (\bigcup A_i) \leq \sum p (A_i) $
added 2 characters in body; edited title
Apr
12
revised Determine the units of the ring $A= \mathbb Z[X]/(X^3)$ and the structure of the group $A^*$
added 898 characters in body
Apr
2
revised Dual of a matrix lie algebra
added 23 characters in body
Mar
31
revised Let $|f(z)| \to \infty$ as $|z| \to \infty$, prove that $f(\mathbb{C})= \mathbb{C}$?
deleted 39 characters in body
Mar
27
revised Elementary proof that $\sum_{n \geq 1} \frac{(-1)^n}{\sqrt{n}}+i \frac{1}{n^2}$ is conditionally convergent.
This question isn't about complex analysis.
Mar
25
revised Every nilpotent left ideal is contained in a nilpotent 2 sided ideal.
added 1 character in body
Mar
23
revised Reducibility of $P(X^2)$
I added an invisible string of characters at the end of your answer, this allows me to change my initial mistaken downvote into an upvote.
Mar
23
revised Where did mathematicians learn how to do truth tables?
I added an invisible string of characters at the end so that I may undo an erroneous downvote.
Mar
20
revised Why is $\ker\omega$ integrable iff $\omega\wedge d\omega=0$?
added 4 characters in body
Mar
19
revised Lie group. How is manifold defined?
added 738 characters in body
Mar
16
revised Equilateral triangle in a circle
added 137 characters in body
Mar
14
revised Understanding an example from Hatcher - cellular homology
added 717 characters in body
Mar
8
revised Why is $\deg(f)$ well-defined?
edited body
Mar
8
revised Infinite dimensional space of solutions
added 441 characters in body
Feb
6
revised How to prove that Lie's theorem fails for a field of prime characteristic?
added 54 characters in body
Feb
6
revised Why is this group not free?
deleted 42 characters in body
Feb
2
revised Example of colimit of Hausdorff spaces which is not Hausdorff
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Feb
1
revised Extending homotopies to contract an ascending union of contractible spaces
added 226 characters in body
Jan
30
revised Proposition 4.2 in Goerss & Jardine's *Simplicial homotopy theory*
added 147 characters in body
Jan
29
revised Group theory and centres
edited body