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Feb
19
comment Closed set via addition of two sets
Slightly more interesting would be to show that $A+B$ is closed when $B = \{(x,x) \mid x \in R\}$.
Feb
16
awarded  Notable Question
Feb
9
comment Find the matrix representing T and Find the Image of T (as a span of vectors)
The matrix you found is correct. The image of $T$ is the span of the columns of $A$.
Feb
7
revised For what $n$ is $U_n$ cyclic?
spelling fixed
Feb
5
comment Check the proof of $||x||^2$ is not a norm
@ElChapo Her question is "Can someone check my proof for correctness"
Feb
5
comment Check the proof of $||x||^2$ is not a norm
Yes, that's all correct. You didn't have to do the third case: after 2) you already know that it is not a norm.
Jan
30
comment A question about a proof of Noetherian modules and exact sequences
I don't think a proof-verification can be a duplicate of a newer question. Unless someone posts the exact same proof with the exact same mistakes.
Jan
30
revised A question about a proof of Noetherian modules and exact sequences
edited tags
Jan
30
revised A question about a proof of Noetherian modules and exact sequences
rolled back to a previous revision
Jan
27
revised A question about a proof of Noetherian modules and exact sequences
Image removed and replaced with text.
Jan
25
awarded  Popular Question
Jan
25
awarded  algebraic-topology
Jan
22
comment Is the space $C[0,1]$ complete?
@karhas Yes, that's right: it's definitely needed in the proof that $f$ is the uniform limit of the $f_n$.
Jan
19
revised Nonzero rationals under multiplication are not a cyclic group
added 4 characters in body
Jan
19
revised Show that the set of non zero rationals is not a cyclic group under multiplication.
edited tags
Jan
19
revised Characterize the groups $G$ for which the map $\iota: G \to G$, sending $x \mapsto x^{-1}$ for all $x \in G$, is an automorphism of $G$
added 11 characters in body
Jan
15
answered Question about the $\limsup$ of a bounded function on [0,1)
Jan
13
awarded  Yearling
Jan
12
awarded  Nice Question
Jan
12
awarded  Popular Question