OwnValues[x] gives the rule corresponding to any ownvalue defined for the symbol x.
PermutationMin[perm] returns the smallest integer moved by the permutation perm.
PrivateFontOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for various font suboptions.
Rest
(Built-in Mathematica Symbol) Rest[expr] gives expr with the first element removed.
ScriptSizeMultipliers is an option for Style that specifies how much smaller to render each successive level of subscripts, etc.
StringFormat["string"] attempts to determine what ImportString format could be used to import the string " string".
SyntaxForm is an option for InterpretationBox and TagBox objects that specifies the precedence level to use when the InterpretationBox or TagBox is considered as an operator.
$Post
(Built-in Mathematica Symbol) $Post is a global variable whose value, if set, is applied to every output expression.
Definitions such as f[x_]=x^2 specify values for functions. Sometimes, however, you need to specify general properties of functions, without necessarily giving explicit ...
Differentiating a known function gives an explicit result. Differentiating an unknown function f gives a result in terms of f'. Mathematica applies the chain rule for ...