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doc-src/Tutorial/ToyList/lemma3
changeset 5377
efb799c5ed3c
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5376:60b31a24f1a6
5377:efb799c5ed3c
1
Goal "(xs @ ys) @ zs = xs @ (ys @ zs)";
2
by(induct_tac "xs" 1);
3
by(Auto_tac);