SpanMinSize is an option for selections that specifies the minimum size of spanning characters such as parentheses and brackets.

TreeGraphQ[g] yields True if the graph g is a tree and False otherwise.

$Linked is True if the Mathematica kernel is being run through MathLink.

$Notebooks is True if Mathematica is being used with a notebook-based front end.

Symbolic Computation Values for Symbols Transforming Algebraic Expressions

Functions for constructing matrices. This generates a 2×2 matrix whose i,j^th entry is a[i,j]. Here is another way to produce the same matrix.

Introduction to Editing Mathematica Graphics Drawing Tools Selecting Graphics Objects

Picking out elements of lists. We will use this list for the examples. Here is the last element of t.

Importing and Exporting Data Importing and Exporting Files Exporting Graphics and Sounds

Do Basic Calculations Do Constrained Nonlinear Optimization Control the Precision and Accuracy of Numerical Results