Reputation
10,599
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
1 18 53
Impact
~246k people reached

19h
comment “Cohomology classes correspond to homotopy classes of maps to Eilenberg Maclane spaces” and cup product?
It is in Hatcher chapter 4.
20h
reviewed Looks OK If $4=5$, then $6=8\,$ (yes or no?)
20h
comment Even permutation in Sn
If you have a new question, please ask it by clicking the Ask Question button. Include a link to this question if it helps provide context.
20h
reviewed Looks OK Honest application of category theory
20h
reviewed Looks OK If $4=5$, then $6=8\,$ (yes or no?)
20h
reviewed Close A question in Number Theory - prove there exist m>2010 s.t f(m) is not prime
20h
reviewed Close If $T(v)=0$ for all $v \in V$, then $T=0$.
20h
reviewed No Action Needed Expected Value and variance of a max randomized stocks
1d
comment How many elements does the free product $\mathbb{Z}/2\mathbb{Z}\ast\mathbb{Z}/2\mathbb{Z}$ have?
Since $abab\in N$, you have $ab=ba$ in $G/N$. Thus $aba=a^2b=b$. The same goes for $bab=a$.
2d
comment Ring Homomorphism from $\mathbb{Z}_m$ to $\mathbb{Z}_n$
@RohitDuggal Yes.
2d
answered Ring Homomorphism from $\mathbb{Z}_m$ to $\mathbb{Z}_n$
Apr
16
revised Which group of order 16 is this?
added 11 characters in body
Apr
15
revised Inverting matrix multiplication “and” representing with a smaller sized matrix
added 9 characters in body
Apr
15
comment Inverting matrix multiplication “and” representing with a smaller sized matrix
If $A$ and $C$ are both zero matrices, then you cannot recover $B$.
Apr
15
answered Inverting matrix multiplication “and” representing with a smaller sized matrix
Apr
15
answered Proof linear transformation
Apr
15
comment Proof linear transformation
Are these finite dimensional spaces?
Apr
15
revised Proof linear transformation
deleted 9 characters in body
Apr
15
comment Difference between Wedge of countable infinite circle and Hawaiian ear ring?
The point at which the circles are wedged is different. In the countable wedge of circles, that point has a contractible neighborhood. In the Hawaiian earrings that point does not have a contractible neighborhood.
Apr
12
reviewed No Action Needed Find the position of a circle tangent to two other circles