PolynomialGCD[poly_1, poly_2, ...] gives the greatest common divisor of the polynomials poly_i. PolynomialGCD[poly_1, poly_2, ..., Modulus -> p] evaluates the GCD modulo the ...
PositiveDefiniteMatrixQ[m] tests whether m is a positive definite matrix.
QBinomial[n, m, q] gives the q-binomial coefficient (n; m)_q.
SetSharedVariable[s_1, s_2, ...] declares the symbols s_i as shared variables whose values are synchronized among all parallel kernels.
SolveAlways[eqns, vars] gives the values of parameters that make the equations eqns valid for all values of the variables vars.
Speak
(Built-in Mathematica Symbol) Speak[expr] speaks a spoken representation of the expression expr.
Sqrt
(Built-in Mathematica Symbol) Sqrt[z] or Sqrt[z] gives the square root of z.
StableDistribution[type, \[Alpha], \[Beta], \[Mu], \[Sigma]] represents the stable distribution S_type with index of stability \[Alpha], skewness parameter \[Beta], location ...
StirlingS2[n, m] gives the Stirling number of the second kind \[ScriptCapitalS]_n^(m).
SystemsModelDimensions[sys] gives the number of inputs and outputs of a StateSpaceModel or TransferFunctionModel object sys.