Comment #3 on issue 2076 by smichr: intcache error http://code.google.com/p/sympy/issues/detail?id=2076
What was happening is a routine that was suppose to be dealing in integers created an Integer when abs() was used. The solution was to import pythons abs to override the sympy abs. This is a pretty subtle little thing that can have devastating consequences on runtimes in such routines.
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