PaneSelector[{v_1 -> expr_1, v_2 -> expr_2, ...}, v] represents an object that displays as a pane containing the expr_i for which v_i is equal to v.
Parallelization is an option for Compile that specifies whether it should create a compiled function that could run in parallel.
ParallelNeeds["context"] evaluates Needs["context"] on all available parallel kernels.
PauliMatrix[k] gives the k\[Null]^th Pauli spin matrix \[Sigma]_k.
PermutationLength[perm] returns the number of integers moved by the permutation perm.
PermutationListQ[expr] returns True if expr is a valid permutation list and False otherwise.
PermutationMax[perm] returns the largest integer moved by the permutation perm.
PermutationPower[perm, n] gives the n\[Null]^th permutation power of the permutation perm.
PermutationSupport[perm] returns the support of the permutation perm.
Pick
(Built-in Mathematica Symbol) Pick[list, sel] picks out those elements of list for which the corresponding element of sel is True. Pick[list, sel, patt] picks out those elements of list for which the ...