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Mirrors > Home > ILE Home > Th. List > modc | Unicode version |
Description: Equivalent definitions of "there exists at most one," given decidable existence. (Contributed by Jim Kingdon, 1-Jul-2018.) |
Ref | Expression |
---|---|
modc.1 |
Ref | Expression |
---|---|
modc | DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | modc.1 | . . 3 | |
2 | 1 | mo23 1982 | . 2 |
3 | exmiddc 777 | . . 3 DECID | |
4 | 1 | mor 1983 | . . . 4 |
5 | 1 | mo2n 1969 | . . . . 5 |
6 | 5 | a1d 22 | . . . 4 |
7 | 4, 6 | jaoi 668 | . . 3 |
8 | 3, 7 | syl 14 | . 2 DECID |
9 | 2, 8 | impbid2 141 | 1 DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 102 wb 103 wo 661 DECID wdc 775 wal 1282 wnf 1389 wex 1421 wsb 1685 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-11 1437 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 |
This theorem is referenced by: mo2dc 1996 |
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