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Log of /metaprl/theories/czf/czf_itt_inv_image.ml

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Revision 3567 - (view) (download) (annotate) - [select for diffs]
Modified Tue Apr 9 05:57:26 2002 UTC (19 years, 2 months ago) by xiny
File length: 2470 byte(s)
Diff to previous 3546
1. Redefined inverse image. Previously it was defined by introduction
   and elimination rules; now it can be rewritten with "setbvd_prop".
   Actually, after "setbvd_prop" is defined, the "inv_image" is somewhat
   unnecessary. I keep it here just in case that people may want to use
   the concept of inverse image sometimes.
2. Fixed the error in the previous member elimination rule.

Revision 3546 - (view) (download) (annotate) - [select for diffs]
Added Sun Mar 24 08:21:13 2002 UTC (19 years, 3 months ago) by xiny
File length: 2330 byte(s)
Added the module for the inverse image of set t in set s under function f:
   { x in s | f(x) in t }

I didn't find a direct way to define it, so I define it using axioms.

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