Specifying formats for text in graphics. Here is a plot with default settings for all formats. Here is the same plot, but now using a 12-point bold font.

"Defining Functions" discusses how you can define functions in Mathematica. In a typical case, you would type in f[x_]=x^2 to define a function f. (Actually, the definitions ...

This dialog displays information regarding the editing times of the input notebook. This is a "live" dialog that dynamically updates as changes are made to the notebook. It ...

Particularly when you write procedural programs in Mathematica, you will often need to modify the value of a particular variable repeatedly. You can always do this by ...

Expand[expr] expands out products and positive integer powers in expr. Expand[expr, patt] leaves unexpanded any parts of expr that are free of the pattern patt. >

FullSimplify[expr] tries a wide range of transformations on expr involving elementary and special functions, and returns the simplest form it finds. FullSimplify[expr, assum] ...

DateListPlot[{{date_1, v_1}, {date_2, v_2}, ...}] plots points with values v i at a sequence of dates.DateListPlot[{v_1, v_2, ...}, datespec] plots points with dates at equal ...

Beep[] generates an audible beep when evaluated.

BinaryImageQ[image] yields True if image has the form of a binary image, and False otherwise.

ColorNegate[image] gives the negative of image, in which all colors have been negated.