jrjohansson/sympy-quantum-notebooks — pull request #4 by eunjongkim (2014-09-25 13:30:40+00:00)
Title: updated Expectation, Covariance class: included normal ordering features

included the normal ordered expectation and covariance in the class. If the last argument `is_normal_order` is `True`, returns the normal ordered forms <:A:>, <: A, B :>.
by `.doit()`, the normal ordering is accomplished.