Mon, 19 Jul 1999 15:31:42 +0200 paulson deleted a reference to "nat", now erroneous because "nat" is a function
Mon, 19 Jul 1999 15:30:59 +0200 paulson many new laws about div and mod
Mon, 19 Jul 1999 15:29:30 +0200 paulson new theorem zless_zero_nat
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