$DateStringFormat (Built-in Mathematica Symbol)

$DateStringFormat gives the default format to use for date strings generated by DateString.

$FrontEndSession (Built-in Mathematica Symbol)

$FrontEndSession is a global symbol that represents the current session of the front end from which the kernel is being run.

$Messages (Built-in Mathematica Symbol)

$Messages gives the list of files and pipes to which message output is sent.

$Post (Built-in Mathematica Symbol)

$Post is a global variable whose value, if set, is applied to every output expression.

Applying Functions Repeatedly (Mathematica Tutorial)

Many programs you write will involve operations that need to be iterated several times. Nest and NestList are powerful constructs for doing this. Applying functions of one ...

Compiling Mathematica Expressions (Mathematica Tutorial)

If you make a definition like f[x_]:=x Sin[x], Mathematica will store the expression x Sin[x] in a form that can be evaluated for any x. Then when you give a particular value ...

Converting between Strings, Boxes, and ... (Mathematica Tutorial)

Converting between strings, boxes, and expressions. Here is a simple expression. This gives the InputForm of the expression as a string.

Chini Equations (Mathematica Tutorial)

Chini equations are a generalization of Abel and Riccati equations. This solves a Chini equation.

Linear and Quasi-Linear PDEs (Mathematica Tutorial)

First-order PDEs are usually classified as linear, quasi-linear, or nonlinear. The first two types are discussed in this tutorial. A first-order PDE for an unknown function ...

Nonlinear Second-Order ODEs (Mathematica Tutorial)

The general form of a nonlinear second-order ODE is For simplicity, assume that the equation can be solved for the highest-order derivative y^ ′′(x) to give There are a few ...