BUILT-IN MATHEMATICA SYMBOL

Rule

or
represents a rule that transforms lhs to rhs.

Details Details

The character can be entered as Esc->Esc or \[Rule].
evaluates rhs immediately.
You can apply rules using Replace.
The assignment specifies that the rule should be used whenever it applies.
In StandardForm, Rule is printed using .
Symbols that occur as pattern names in lhs are treated as local to the rule. This is true when the symbols appear on the right-hand side of conditions in lhs, and when the symbols appear anywhere in rhs, even inside other scoping constructs.
Rule constructs can be nested in any way. Rule is treated as a scoping construct, so that inner variables are renamed if necessary.