How many ways can the product $x_1x_2...x_n$ be parenthesized?
1357
How many ways are there to parenthesise an expression?
153721
Conjugating a permutation
70989
Looking for an elegant way to construct this tensor-product-ish list
8742
Examples and further results about the order of the product of two elements in a group
83346
Finding a closed form $x_n$ for the recurrence relation $x_{n+2} = px_{n+1} + qx_n + r$
24212
proving how many permutations exist.
143264
Is there a nice way of expanding multinomials of the form $(1+x+\cdots+x^l)^n$?
55840
Number of functions from n-element set to {1, 2, …, m}
39957
Product of binomial coefficient as a basis
148413
Proving $S_n$ is generated by the set $\{(1\text{ }2),(2\text{ }3),\cdots,(n-1\text{ }n)\}$ of $n-1$ transpositions.
141313
Inline elements denoted by {{}}? Cartesian product of these inline elements?
103106
Proving that any permutation in $S_n$ can be written as a product of disjoint cycles
6398
Can the product of an $4\times 3$ matrix and a $3\times 4$ matrix be invertible?
125833
Semidirect Products with GAP
154698
Union of Cartesian products: $X \times (Y \cup Z)= (X \times Y) \cup(X\times Z)$
110464
Let $A=\{1,...,n\}.$ Show that there is a bijection of $P(A)$ with the cartesian product $X^n$ where $X$ is the two element set $X=\{0,1\}$
10998
Embedding $S_n$ in $A_{2n}$