Replace[expr, rules] applies a rule or list of rules in an attempt to transform the entire expression expr. Replace[expr, rules, levelspec] applies rules to parts of expr ...

Shortest[p] is a pattern object that matches the shortest sequence consistent with the pattern p.

StringTake["string", n] gives a string containing the first n characters in " string". StringTake["string", -n] gives the last n characters in " string". StringTake["string", ...

x_y^z is the low-level box representation for x_y^z in notebook expressions.

TagBox[boxes, tag] is a low-level box construct that displays as boxes but maintains tag to guide the interpretation of boxes on input.

TextJustification is an option for Cell and Inset which specifies how much lines of text can be stretched in order to make them be the same length.

UnderscriptBox[x, y] is the low-level box representation for UnderscriptBox[x, y] in notebook expressions.

When you use //N to get a numerical result, Mathematica does what a standard calculator would do: it gives you a result to a fixed number of significant figures. You can also ...

Converting between strings and lists of characters. This gives a list of the characters in the string. You can apply standard list manipulation operations to this list.

Mathematica handles many different kinds of things: mathematical formulas, lists, and graphics, to name a few. Although they often look very different, Mathematica represents ...