Thu, 12 Jan 1995 10:39:47 +0100 lcp Proved sum_bij, sum_ord_iso_cong, prod_bij,
Thu, 12 Jan 1995 03:04:10 +0100 lcp Proved case_cong and case_case.
Thu, 12 Jan 1995 03:03:45 +0100 lcp Renamed single_fun to singleton_fun.
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