4,206 reputation
1025
bio website
location
age
visits member for 3 years, 6 months
seen 10 hours ago

Jun
21
reviewed No Action Needed What is the next number in the sequence: $24, 30, 33 , 39 , 51,…$
Jun
21
reviewed No Action Needed Is every element in a set also an element of the powerset?
Jun
21
reviewed Leave Open Terminology for a rectangle whose width/height ratio is between $r$ and $1/r$?
Jun
20
reviewed Looks OK Checking if a function is injective
Jun
20
reviewed No Action Needed Orthogonal transformation on random matrices
Jun
18
answered Directions in spherical coordinates
Jun
18
comment Directions in spherical coordinates
Do you also know the starting coordinates? If not, the answer is that you can't: in almost all cases, the best you can do is to narrow it down to two possibilities, and in some cases there are infinitely many possibilities.
Jun
17
reviewed Edit suggested edit on Why does this theorem fail for arbitrarily large n?
Jun
17
revised Why does this theorem fail for arbitrarily large n?
Extended suggested edit to include the bottom half of the second image
Jun
17
reviewed Reject suggested edit on isomorphism of $Q[x]/(x^2-3x + 2)$ and the ring, former by pairs $(a,b)$ with component addition and multiplication
Jun
17
comment Inverse of a polynomial function
What you effectively want to do is to solve the cubic $x^3 - 3x^2 + 4y = 0$ for values of $y \in [0\ldots 2]$. The tricky bit is that the range of $x$ specified is precisely that range for which there are three real roots, so you have to select the correct one.
Jun
17
reviewed Leave Open Jordan blocks and the characteristic polynomial.
Jun
17
answered multiplication in GF(256) (AES algorithm)
Jun
17
comment multiplication in GF(256) (AES algorithm)
I wanted to tidy up the chain of computation, but I couldn't understand what you were doing, so I've just added $ symbols to invoke $\LaTeX$ markup.
Jun
17
revised multiplication in GF(256) (AES algorithm)
Add some $ signs and make some linguistic tweaks
Jun
15
reviewed Close Image in abelian categories
Jun
15
reviewed Close When is a combinations of subrings a subring?
Jun
13
reviewed Close Introductory books on complex analysis?
Jun
13
reviewed Leave Open General term for the given sequence
Jun
12
reviewed Approve suggested edit on problem concerning continuity of functions