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doc-src/Tutorial/ToyList/lemma3
author
wenzelm
Wed, 23 Jan 2002 16:57:33 +0100
changeset 12837
74ce01905e57
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
* HOL: nat_number_of;
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);