InverseJacobiSD[v, m] gives the inverse Jacobi elliptic function sd -1 (v \[VerticalSeparator] m).
InverseJacobiSN[v, m] gives the inverse Jacobi elliptic function sn -1 (v \[VerticalSeparator] m).
Length
(Built-in Mathematica Symbol) Length[expr] gives the number of elements in expr.
MonomialList[poly] gives the list of all monomials in the polynomial poly.MonomialList[poly, {x_1, x_2, ...}] gives the list of monomials with respect to the variables x_i in ...
NHoldAll is an attribute which specifies that none of the arguments to a function should be affected by N.
PolynomialQuotient[p, q, x] gives the quotient of p and q, treated as polynomials in x, with any remainder dropped.
PrecisionGoal is an option for various numerical operations which specifies how many effective digits of precision should be sought in the final result.
PrimePowerQ[expr] yields True if expr is a power of a prime number, and yields False otherwise.
Remove
(Built-in Mathematica Symbol) Remove[symbol_1, ...] removes symbols completely, so that their names are no longer recognized by Mathematica. Remove["form_1", "form_2", ...] removes all symbols whose names ...
UnitVector[k] gives the two-dimensional unit vector in the k\[Null]^th direction.UnitVector[n, k] gives the n-dimensional unit vector in the k\[Null]^th direction.