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doc-src/Tutorial/ToyList/lemma3
author
wenzelm
Mon, 17 May 1999 21:31:08 +0200
changeset 6659
7a056250899d
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
removed get_nodes; added keys; all_preds / all_succs: topological order; added del_nodes;
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);