Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 3641 by [email protected]: deep processing should be generalized
http://code.google.com/p/sympy/issues/detail?id=3641

expand currently handles all deep processing automatically with the _expand_hint method on Expr. This function can easily be modified to work with any function. The only requirement is that an object be rebuildable from args.

So we should refactor all methods that use deep to use this, and make the API to only apply to the top-level function. One method that I know of is doit. There are probably others. Let's move the function to utilities or Basic or something and give it a better name, and make it public API.

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