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Oct
29
reviewed Reject Counterexample for $A,B\triangleleft G,G/A\cong B \Rightarrow G/B\cong A$
Oct
27
reviewed Reopen I am not how they got characteristic equation from the given equation.
Oct
27
reviewed Close Area between $y = 5+x-x^2$ and $y = x+4$
Oct
26
answered Finding element in binary representation of $GF(2^6)$
Oct
26
comment Freeman Dyson's example of an unprovable truth
That fills the gap nicely. Thanks.
Oct
26
comment Freeman Dyson's example of an unprovable truth
I don't see the relevance of your comments on "unlikely" true statements. The contrapositive of "it seems likely, so it must be true" is not "it seems unlikely, so it must be false".
Oct
25
reviewed Close Determination of a uniformly continuous, not locally Hölder-continuous function over an open set
Oct
25
reviewed Leave Open Homomorphisms from the additive groups of virtual characters into certain idele groups
Oct
24
comment Show that if $F$ is multiplicative, then $f$ is multiplicative
How do you justify $$\sum_{d\mid n_1n_2} \mu(d)F(n_1n_2/d) = \sum_{d\mid n_1n_2} \mu(d)F(n_1/d)F(n_2/d)$$?
Oct
23
answered Project Euler's Problem Number 88
Oct
23
comment Special case of the Schroeder-Bernstein Theorem
I think you mean $f(U)'$, not $f(U')$, but what does the prime signify in this book? Is it set complement?
Oct
20
awarded  Reviewer
Oct
18
reviewed Approve What is up with the x! divisions when dealing with cards?
Oct
18
reviewed Reviewed derivative of limit function vs limit of derivatives
Oct
18
reviewed Close A matrix problem 2
Oct
18
reviewed Close How to find the second derivative of an implicit function?
Oct
17
reviewed Close Let $R$ be an infinite commmutative ring which contains a zero divisor. Show that there exists infinite many zero divisors.
Oct
17
reviewed Close $f(x+y)=f(x)f(y)$
Oct
17
comment $f(x+y)=f(x)f(y)$
This question is a question on an open contest and the contest organisation has requested that it be closed until the contest finishes.
Oct
17
reviewed Leave Open If prime $p\not \equiv 1 \pmod 3$, then $p^2 = a^2 + ab + b^2$ has no solutions $a,\,b \in \mathbb{N} \}$