Tue, 07 Nov 2017 15:16:40 +0100 blanchet added FIXMEs
Tue, 07 Nov 2017 14:52:27 +0100 nipkow Replaced { } proofs by local lemmas; added Hoare logic with logical variables.
Tue, 07 Nov 2017 11:11:37 +0100 wenzelm backed out odd "bug fix" 671decd2e627;
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