Thu, 28 Sep 2017 15:11:32 +0200 wenzelm session-qualified theory names are mandatory;
Thu, 28 Sep 2017 11:53:55 +0200 wenzelm discontinued extra checks (see ce676a750575 and 60c159d490a2) -- qualified theory names are meant to cover this;
Fri, 29 Sep 2017 16:55:08 +0100 paulson eliminated a needless dependence on the theorem homeomorphic_punctured_sphere_affine_gen
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