RankedMin[list, n] gives the n\[Null]^th smallest element in list.

Refine[expr, assum] gives the form of expr that would be obtained if symbols in it were replaced by explicit numerical expressions satisfying the assumptions assum. ...

RegularExpression["regex"] represents the generalized regular expression specified by the string " regex".

RootSum[f, form] represents the sum of form[x] for all x that satisfy the polynomial equation f[x] == 0.

Sech[z] gives the hyperbolic secant of z.

SetSharedFunction[f_1, f_2, ...] declares the symbols f_i as shared functions whose downvalues are synchronized among all parallel kernels.

Sinh[z] gives the hyperbolic sine of z.

SortBy[list, f] sorts the elements of list in the order defined by applying f to each of them.

SoundNote[pitch] represents a music-like sound note with the specified pitch.SoundNote[pitch, t] takes the note to have duration t.SoundNote[pitch, {t_min, t_max}] takes the ...

Subsets[list] gives a list of all possible subsets of list. Subsets[list, n] gives all subsets containing at most n elements. Subsets[list, {n}] gives all subsets containing ...