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New posts in permutations
Can you completely permute the elements of a matrix by applying permutation matrices?
linear-algebra
matrices
permutations
permutation-matrices
Showing that $Q_n=D_n+D_{n-1}$
combinatorics
permutations
Proving that $A_n$ is the only proper nontrivial normal subgroup of $S_n$, $n\geq 5$
group-theory
permutations
Selecting a strictly positive permutation from a stochastic matrix
linear-algebra
matrices
permutations
stochastic-matrices
"Absolute" version of determinant
linear-algebra
matrices
permutations
determinant
permanent
How many lists of 100 numbers (1 to 10 only) add to 700?
permutations
combinations
How many possible combinations in 8 character password?
combinatorics
permutations
Number of subsets of a set having r elements
combinatorics
binomial-coefficients
permutations
Why are Stirling numbers of the first kind related to the number of permutations with $k$ cycles?
combinatorics
permutations
generating-functions
stirling-numbers
permutation-cycles
Number of values of expression $\frac{k}{3} + \frac{m}{8}$ which are less than 6
combinatorics
permutations
Social Golfer Problem - Quintets
combinatorics
permutations
recreational-mathematics
open-problem
Why is the holomorph of a group $G$ a group of transformations of $G$?
abstract-algebra
group-theory
permutations
holomorph
expected absolute difference between shuffled range of numbers
probability
permutations
expected-value
uniform-distribution
Determine order of $\langle(12345),(2354)\rangle$.
abstract-algebra
group-theory
permutations
symmetric-groups
Is War necessarily finite?
abstract-algebra
combinatorics
algorithms
permutations
game-theory
Explanation circular permutation
combinatorics
permutations
Polynomials and partitions
abstract-algebra
combinatorics
polynomials
permutations
Combination of smartphones' pattern password
combinatorics
permutations
Is a Sudoku a Cayley table for a group?
combinatorics
group-theory
finite-groups
permutations
sudoku
"Efficient version" of Cayley's Theorem in Group Theory
group-theory
permutations
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