ReplaceRepeated
 Usage
• expr //. rules repeatedly performs replacements until expr no longer changes.
Notes
• expr //. rules effectively applies /. repeatedly, until the results it gets no longer change. • It performs one complete pass over the expression using /., then carries out the next pass. • You should be very careful to avoid infinite loops when you use the //. operator. The command x //. x -> x + 1 will, for example, lead to an infinite loop. • ReplaceRepeated takes the option MaxIterations, which specifies the maximum number of times it will try to apply the rules you give. The default setting is MaxIterations -> 65536. With MaxIterations -> Infinity there is no limit. • New in Version 1.
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