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May
31
answered Finding the order of Z(G) in a non-Abelian group of order 8
May
30
answered determining a linear isomorphism so that two quadratic forms become equivalent
May
28
answered Show that $f(x)=a_0+a_1x+a_2x^2+\cdots+a_nx^n\in R[x]$ is nilpotent iff $a_0,a_1,a_2,\ldots,a_n$ are nilpotent
May
25
answered Let $T:U\rightarrow V$ be a linear map and suppose that $rank(T)=dim(U)=dim(V)=n$. Show that the are bases where the matrix is $I_n$
May
16
answered In a commutative ring with identity, if $p$ is irreducible, is ($p$) a maximal ideal?
Apr
21
answered How do I prove that $\{AB-BA\}$ does not span matrix space?
Mar
14
answered Prove that if $N(z)$ is irreducible in $\Bbb{Z}$ then $z$ is irreducible in $\Bbb{Z}[\sqrt{\alpha}]$.
Feb
15
answered Elementary question on stabilizer and S3
Feb
7
answered The function given by the Rao-Blackwell theorem is a statistic
Feb
1
answered Proving the minimality of an element order
Jan
22
answered Why is every sequential map uniformly continuous
Nov
30
answered Probability and recurrence
Nov
3
answered imprisoned in a cell where there are only 3 ways out ,each of which are equally likely
Nov
1
answered How to prove that: $f(A\cap B) \subseteq f(A) \cap f(B)$, and some few others
Nov
1
answered How to find a non-Gaussian function f(x) that satisfies the following condition:
Oct
27
answered How do you say that variable is randomly chosen with a random distribution for range [3, 42]?
Oct
21
answered Last 3 digits of $7^{12341}$
Sep
23
answered $\sum_{k=0}^n \binom{n}{k}^2 = \binom{2n}{n}?$
Sep
14
answered Forming a new matrix by adding the same number to any row or column
Sep
10
asked Forming a new matrix by adding the same number to any row or column