NotebookSave[notebook] saves the current version of the specified notebook. NotebookSave[notebook, " file"] saves the notebook in the specified file. NotebookSave[] saves the ...
NumberMarks is an option for InputForm and related functions that specifies whether ` marks should be included in the printed forms of approximate numbers.
NumberSeparator is an option for NumberForm and related functions which gives the string to insert at breaks between digits.
OneIdentity is an attribute that can be assigned to a symbol f to indicate that f[x], f[f[x]], etc. are all equivalent to x for the purpose of pattern matching.
OpenRead["file"] opens a file to read data from, and returns an InputStream object.
PauliMatrix[k] gives the k\[Null]^th Pauli spin matrix \[Sigma]_k.
PerformanceGoal is an option for plotting and various other algorithmic functions that specifies what aspect of performance to try to optimize with Automatic settings for ...
PermutationCyclesQ[expr] returns True if expr is a permutation in disjoint cyclic form, and False otherwise.
PhaseMargins[sys] gives the phase margins of a linear time-invariant system sys.
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 ...