NRoots
(Built-in Mathematica Symbol) NRoots[lhs == rhs, var] yields a disjunction of equations which represent numerical approximations to the roots of a polynomial equation.
Sow
(Built-in Mathematica Symbol) Sow[e] specifies that e should be collected by the nearest enclosing Reap. Sow[e, tag] specifies that e should be collected by the nearest enclosing Reap whose pattern ...
A Clairaut equation is a first-order equation of the form A remarkable feature of this nonlinear equation is that its general solution has a very simple form. This is an ...
In some cases you may need to specify pattern sequences that are more intricate than things like x__ or x..; for such situations you can use PatternSequence[p_1,p_2,…]. ...
DefaultButton[] represents an OK button that closes a dialog, and is the default when DynamicBox[ToBoxes[If[$OperatingSystem === "MacOSX", "Return", "Enter"], StandardForm], ...
DaubechiesWavelet[] represents a Daubechies wavelet of order 2. DaubechiesWavelet[n] represents a Daubechies wavelet of order n.
AiryBiPrime[z] gives the derivative of the Airy function Bi^\[Prime] (z).
InverseEllipticNomeQ[q] gives the parameter m corresponding to the nome q in an elliptic function.
QBinomial[n, m, q] gives the q-binomial coefficient (n; m)_q.
ArcCosh
(Built-in Mathematica Symbol) ArcCosh[z] gives the inverse hyperbolic cosine cosh -1 (z) of the complex number z.