Added BCHExpansion to Perturbation module #12
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There is a bug with the current implementation where the the factorial coefficient begins at 1!, and not 0!. |
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Should be good to go when fixed. Also, we should get in the habit of using tests, which for this, would be in |
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I will add some generic tests and fix the bug. |
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Added the BCHExpansion to the Perturbation module. See https://en.wikipedia.org/wiki/Baker%E2%80%93Campbell%E2%80%93Hausdorff_formula#An_important_lemma for background, and http://journals.aps.org/pra/pdf/10.1103/PhysRevA.75.032329 for use case.