ReplaceAll
 Usage
• expr /. rules applies a rule or list of rules in an attempt to transform each subpart of an expression expr.
Notes
• Example: x + 2 /. x -> a  . • ReplaceAll looks at each part of expr, tries all the rules on it, and then goes on to the next part of expr. The first rule that applies to a particular part is used; no further rules are tried on that part, or on any of its subparts. • ReplaceAll applies a particular rule only once to an expression. • Example: x /. x -> x + 1 . • See the notes on Replace for a description of how rules are applied to each part of expr. • expr /. rules returns expr if none of the rules apply. • New in Version 1.
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