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Aug
5
awarded  Yearling
May
19
awarded  Custodian
May
19
revised If $f:X \to [0,1]$ be an onto continuous map and $\{f^{-1} (y)\}$ is compact then Is $X$ compact?
Cleared up unclear language.
Apr
23
answered Same Expansion for Different Functions! What's Wrong?
Mar
2
revised If $\tan x=\sin x/\cos x$ then what is $\tan 3x$ equal to?
fixed typo
Dec
10
awarded  Enlightened
Dec
10
awarded  Nice Answer
Dec
9
awarded  Caucus
Nov
30
revised For $n\times n$ matrices $A,B,$ and $C,$ is it always true that $\mathrm{rank}(ABC)\leq\mathrm{rank}(AC)$?
added 80 characters in body
Nov
30
answered For $n\times n$ matrices $A,B,$ and $C,$ is it always true that $\mathrm{rank}(ABC)\leq\mathrm{rank}(AC)$?
Nov
12
answered The jelly bean box problem
Sep
24
awarded  Autobiographer
Aug
5
awarded  Yearling
Jul
3
comment Prove that this affine transformation is a translation
I expect $\phi(P)P$ is the affine hull (line through) the distinct points $\phi(P)$ and $P$. This is why $\phi$ has to have no fixed points.
Jun
26
comment Proving any N x M undirected two dimensional grid is bipartite
This works. It's more concise to say that you are coloring based on the parity of $i+j$.
Jun
26
comment Proving any N x M undirected two dimensional grid is bipartite
You didn't color all the vertices -- only ones where one coordinate is even and the other odd. However, the idea is sound -- coloring based on parity will work here.
Jun
26
comment Question from Munkres algebraic topology section 58: retractions
It would probably good for your question to say what $j_*$ is (I assume the map induced on $\pi_1$, but it would be good to specify.)
Jun
10
answered Shortest path between wikipedia articles
May
23
awarded  Nice Answer
May
21
answered induced sequence exact