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doc-src/Tutorial/ToyList/lemma3
author
paulson
Wed, 14 Feb 2001 12:16:32 +0100
changeset 11115
285b31e9e026
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
a new theorem from Bryan Ford
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);