sympy/sympy — pull request #1333 by gdevanla (2012-06-07 11:13:50+00:00)
Title: For Review : Basic Trace features and entropy function in density

This PR is just to review the overall design of Trace operation. The current version only implements full trace and ignore the indices used while creating Tr object for partial traces.

I have comments in function that needs to be reviewed by implementation is crystallized.