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doc-src/Tutorial/ToyList/lemma3
author
wenzelm
Fri, 02 Aug 2002 11:49:55 +0200
changeset 13443
1c3327c348b3
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
typedef: "open" option;
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);