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doc-src/Tutorial/ToyList/lemma3
author
wenzelm
Thu, 01 Jul 1999 17:41:16 +0200
changeset 6872
b250da153b1e
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
fixed backtracking of global_qed;
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);