Fri, 23 Mar 2018 23:31:59 +0100 wenzelm added command "purge_theories";
Fri, 23 Mar 2018 22:53:32 +0100 wenzelm clarified signature -- eliminated somewhat pointless positions;
Fri, 23 Mar 2018 22:44:43 +0100 wenzelm clarified signature -- more like use_theories;
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