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doc-src/Tutorial/ToyList/lemma3
author
wenzelm
Tue, 19 Feb 2002 23:49:26 +0100
changeset 12900
2be514a36aec
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
Paulson:1989;
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);