Comment #13 on issue 3222 by [email protected]: Memory problems with the cache
http://code.google.com/p/sympy/issues/detail?id=3222

A simple yet efficient idea for the cache is employing the least-recently-used-like (LRU-like) list. Every cache "hit" moves an item to the top of the list. When a new item (due to the cache "miss") is added to the cache (to the top of the list) and the limit of the cache (e.g. 1000 items) is exceeded, the bottommost item is removed.

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