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doc-src/Tutorial/ToyList/lemma3
author
aspinall
Tue, 16 Nov 2004 20:20:14 +0100
changeset 15289
1d2dba93ef08
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
Markup obtain as introducing a nested goal.
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
by(induct_tac "xs" 1);
by(Auto_tac);