Comment #7 on issue 1980 by [email protected]: has, has_any_symbols, has_all_symbols unified
http://code.google.com/p/sympy/issues/detail?id=1980
Unless there is further discussion, this will be added with the default behavior the same as master: "expr has any of the given patterns". There are 23 locations where multiple arguments or *patterns are sent to has() and they all depend on the "has any" syntax.
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