Wed, 21 Feb 2018 18:41:41 +0100 wenzelm explicit operations to instantiate frees: typ, term, thm, morphism;
Wed, 21 Feb 2018 18:37:04 +0100 wenzelm more operations for ctyp, cterm;
Wed, 21 Feb 2018 16:26:42 +0100 wenzelm minor tuning and clarification;
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