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 Mar4 accepted How do I design a generating function to count subsets of distinct objects? Feb2 accepted How to tell if I am double counting in a combinatorics problem? Dec17 accepted How does the triangle inequality work for $|x-y|$? Nov4 accepted Finding the matrix of a linear transformation relative to two non-standard bases Oct23 accepted What is an “incongruent” solution? Oct14 accepted What is an intuitive definition of the zero vector? Oct14 accepted Construct a basis for $\mathbb{R}^4$ given two vectors and any two of the standard basis vectors in $\mathbb{R}^4$ Oct14 accepted Number theory GCD word problem Oct14 accepted Can a matrix have a null space that is equal to its column space? Oct14 accepted If matrices $B$ and $AB$ have the same rank, show that they have the same null spaces. Oct14 accepted Prove that the Diophantine equation $ax+by+cz=e$ has a solution if and only if $(a,b,c)\mid e$. Oct14 accepted Formally prove: $\lim_{n\to\infty}x_n=L_1\Longrightarrow\lim_{n\to\infty}x_{n+k}=L_1,\forall k\in\mathbb{N}$ Oct14 accepted How can I prove that one of $n$, $n+2$, and $n+4$ must be divisible by three, for any $n\in\mathbb{N}$ Oct14 accepted How to show that $\sum_{i=0}^{n-1}x^i=\frac{1}{1-x}-x^n=\frac{x^n-1}{x-1}$ Oct12 accepted What is the symbol $\triangleq$? Oct8 accepted Can a directed hamiltonian path be found in polynomial time? Oct4 accepted How to show that $(3k+2,5k+3)=1$ for all $k\in\mathbb{Z}$ Oct4 accepted How do I solve a linear Diophantine equation with three unknowns? Sep28 accepted Why are certain greek characters used predominantly for certain purposes in mathematics? Sep28 accepted How to prove $(1+x)^n\geq 1+nx+\frac{n(n-1)}{2}x^2$ for all $x\geq 0$ and $n\geq 1$?