paulson [Mon, 26 May 1997 12:54:40 +0200] rev 3348
Two useful facts about Powersets suggested by Florian Kammueller
paulson [Mon, 26 May 1997 12:53:45 +0200] rev 3347
Added a missing "result();" after problem 43.
paulson [Mon, 26 May 1997 12:44:04 +0200] rev 3346
Tidying using the new exhaust_tac
paulson [Mon, 26 May 1997 12:42:38 +0200] rev 3345
Now recdef checks the name of the function being defined.
Slight tidying
paulson [Mon, 26 May 1997 12:40:51 +0200] rev 3344
Deleted option_case_tac because exhaust_tac performs a similar function.
Deleted the duplicate proof of expand_option_case...
paulson [Mon, 26 May 1997 12:39:57 +0200] rev 3343
Renamed lessD to Suc_leI
paulson [Mon, 26 May 1997 12:38:29 +0200] rev 3342
New operator "lists" for formalizing sets of lists
paulson [Mon, 26 May 1997 12:37:24 +0200] rev 3341
New theorem subset_inj_onto
paulson [Mon, 26 May 1997 12:36:56 +0200] rev 3340
Two results suggested by Florian Kammueller
paulson [Mon, 26 May 1997 12:36:16 +0200] rev 3339
Tidying and a couple of useful lemmas