InverseGudermannian[z] gives the inverse Gudermannian function gd -1 (z).

x < y yields True if x is determined to be less than y. x_1 < x_2 < x_3 yields True if the x_i form a strictly increasing sequence.

LinkLaunch["prog"] starts the external program prog and opens a MathLink connection to it.

expr >> filename writes expr to a file. Put[expr_1, expr_2, ..., " filename"] writes a sequence of expressions expr_i to a file. Put["filename "] creates an empty file with ...

RamanujanTauZ[t] gives the Ramanujan tau Z-function Z(t).

RootApproximant[x] converts the number x to one of the "simplest" algebraic numbers that approximates it well.RootApproximant[x, n] finds an algebraic number of degree at ...

RowBox[{box_1, box_2, ...}] is a low-level box construct that represents a row of boxes or strings in a notebook expression.

SelectedNotebook[] gives the currently selected notebook in the front end.

Share[expr] changes the way expr is stored internally, to try and minimize the amount of memory used. Share[] tries to minimize the memory used to store all expressions.

SpanFromBoth is a symbol that can appear at a particular position in a Grid or related construct to indicate that the corresponding position is occupied by a spanning element ...