[isabelle-dev] NEWS: Thm.cterm_of and Thm.ctyp_of operate on local context
makarius at sketis.net
Thu Apr 2 00:16:14 CEST 2015
* The main operations to certify logical entities are Thm.ctyp_of and
Thm.cterm_of with a local context; old-style global theory variants are
available as Thm.global_ctyp_of and Thm.global_cterm_of.
This refers to Isabelle/291934bac95e -- yet another step in the
There is a tiny semantic snag: both the local and global operations expand
abbreviations from the *global* background theory. Mayne they should not
do anything like that at all, and leave changes to the types/terms to the
canonical "check" phases. But that is another reform, another time.
Hardly any values (thy: theory) should now show up in regular Isabelle/ML
tool implementations. People who still think they don't understand proper
(ctxt: Proof.context) things, should practise more of the art of mental
abstraction -- and look at good examples in the Isabelle code base.
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