Wed, 08 Sep 1999 15:41:30 +0200 generalized the theorem zless_zero_nat to zless_nat_eq_int_zless, and
paulson [Wed, 08 Sep 1999 15:41:30 +0200] rev 7518
generalized the theorem zless_zero_nat to zless_nat_eq_int_zless, and reorganized
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