MathieuS[a, q, z] gives the odd Mathieu function with characteristic value a and parameter q.
PrimeQ
(Built-in Mathematica Symbol) PrimeQ[expr] yields True if expr is a prime number, and yields False otherwise.
QuartileDeviation[list] gives the quartile deviation or semi-interquartile range of the elements in list.QuartileDeviation[dist] gives the quartile deviation or ...
RootMeanSquare[list] gives the root mean square of values in list.
StirlingS1[n, m] gives the Stirling number of the first kind S_n^(m).
TrigFactor[expr] factors trigonometric functions in expr.
TrimmedMean[list, f] gives the mean of the elements in list after dropping a fraction f of the smallest and largest elements.TrimmedMean[list, {f_1, f_2}] gives the mean when ...
Tr
(Built-in Mathematica Symbol) Tr[list] finds the trace of the matrix or tensor list. Tr[list, f] finds a generalized trace, combining terms with f instead of Plus. Tr[list, f, n] goes down to level n in ...
VertexReplace[g, {v_1 -> w_1, v_2 -> w_2, ...}] replaces each vertex v_i in the graph g by w_i.
In many computations you are concerned only with the final result of evaluating the expression given as input. But sometimes you also want to collect expressions that were ...