GoldenRatio is the golden ratio \[Phi] = 1/2 (Sqrt[5] + 1), with numerical value \[TildeEqual] 1.61803.

IntegerString[n] gives a string consisting of the decimal digits in the integer n. IntegerString[n, b] gives a string consisting of the base b digits in the integer n. ...

x*y*z, x*y*z, or x y z represents a product of terms.

The way modules work in Mathematica is basically very simple. Every time any module is used, a new symbol is created to represent each of its local variables. The new symbol ...

Finding elements that match a pattern. This gives the elements of the list which match the pattern x^_. Here is the total number of elements which match the pattern.

All expressions in Mathematica are ultimately built from a small number of distinct types of atomic elements.

 

$LicenseID is a string that gives the license ID under which Mathematica is being run.

The history of an interactive Mathematica computation is both maintained in a fully editable Mathematica notebook, and is stored symbolically in a sequence of In and Out ...

A foundational idea in Mathematica is that all expressions—whatever they may represent—ultimately have a uniform tree-like structure.