Updates:
Summary: xreplace rebuilds expressions when there is no match
Labels: Core
Comment #1 on issue 2900 by ronan.l...@gmail.com: xreplace rebuilds
expressions when there is no match
http://code.google.com/p/sympy/issues/detail?id=2900
Empty rules are just a small aspect of the issue: xreplace shouldn't
rebuild the expression if none of the arguments matches the rule, both for
performance reasons and to avoid unexpected results with unevaluated
expressions.
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