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Aug
4
asked From what set of numbers can $a$ and $b$ be from in the complex number $a+bi\in\mathbb{C}$
Mar
9
asked How can I find the coefficient of a term in this generating function by using the “old” method?
Mar
3
asked How do I design a generating function to count subsets of distinct objects?
Feb
2
asked How to tell if I am double counting in a combinatorics problem?
Dec
17
asked How does the triangle inequality work for $|x-y|$?
Nov
6
asked How to conclusively determine the interior of a set
Nov
4
asked Convert a WFF to Clausal Form
Nov
3
asked Finding the matrix of a linear transformation relative to two non-standard bases
Nov
3
asked How to find the coordinate vector of $\left[\begin{array}{r}x\\y\end{array}\right]$ with respect to some non-standard basis $\mathcal{B}$
Oct
28
asked If $\mathbb{Z}_m^*$ is cyclic, and $\mathbb{Z}_m^*=\langle\overline{g}\rangle$, is $\overline{g}$ a primitive root?
Oct
28
asked What are the generators of $\mathbb{Z}_9^*$?
Oct
27
asked Find the natural numbers $n$ for which $\varphi(n)$ is not divisible by $4$.
Oct
25
answered Solve for n: $\varphi(2n)=\varphi(3n)$
Oct
24
asked Solve for n: $\varphi(2n)=\varphi(3n)$
Oct
23
asked What is an “incongruent” solution?
Oct
22
answered Let $ABC$ be a well-defined product of matrices. Suppose that $A,C$ are both invertible. Prove that $rank(ABC)=rank(B)$.
Oct
22
asked Let $ABC$ be a well-defined product of matrices. Suppose that $A,C$ are both invertible. Prove that $rank(ABC)=rank(B)$.
Oct
16
asked Need help with starting proof
Oct
15
asked Calculate $\lim_{n\to\infty}\frac{1+a+a^2+\dots+a^n}{1+b+b^2+\dots+b^n}$
Oct
14
asked How to solve $9^{89}\equiv x\mod{1000}$ for $0\leq x\leq 999$ without calculating $9^{89}$