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Mirrors > Home > ILE Home > Th. List > eupick | Unicode version |
Description: Existential uniqueness "picks" a variable value for which another wff is true. If there is only one thing such that is true, and there is also an (actually the same one) such that and are both true, then implies regardless of . This theorem can be useful for eliminating existential quantifiers in a hypothesis. Compare Theorem *14.26 in [WhiteheadRussell] p. 192. (Contributed by NM, 10-Jul-1994.) |
Ref | Expression |
---|---|
eupick |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eumo 2031 | . 2 | |
2 | mopick 2077 | . 2 | |
3 | 1, 2 | sylan 281 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wex 1468 weu 1999 wmo 2000 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 |
This theorem is referenced by: eupicka 2079 eupickb 2080 reupick 3360 reupick3 3361 copsexg 4166 eusv2nf 4377 funssres 5165 oprabid 5803 txcn 12444 |
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