Mon, 26 May 1997 12:33:03 +0200 New example ported from ZF
paulson [Mon, 26 May 1997 12:33:03 +0200] rev 3335
New example ported from ZF
Mon, 26 May 1997 12:32:35 +0200 Simplified proofs using expand_option_case
paulson [Mon, 26 May 1997 12:32:35 +0200] rev 3334
Simplified proofs using expand_option_case
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