doc-src/TutorialI/pghead.pdf
author huffman
Fri, 18 Dec 2009 20:13:23 -0800
changeset 34147 319616f4eecf
parent 16383 7dd0eb6e89f9
permissions -rw-r--r--
generalize lemma add_minus_cancel, add lemma minus_add, simplify some proofs

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