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Mirrors > Home > ILE Home > Th. List > mo2n | Unicode version |
Description: There is at most one of something which does not exist. (Contributed by Jim Kingdon, 2-Jul-2018.) |
Ref | Expression |
---|---|
mon.1 |
Ref | Expression |
---|---|
mo2n |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mon.1 | . . 3 | |
2 | 1 | sb8e 1850 | . 2 |
3 | alnex 1492 | . . 3 | |
4 | nfs1v 1932 | . . . . . 6 | |
5 | 4 | nfn 1651 | . . . . 5 |
6 | 1 | nfn 1651 | . . . . 5 |
7 | sbequ1 1761 | . . . . . . 7 | |
8 | 7 | equcoms 1701 | . . . . . 6 |
9 | 8 | con3d 626 | . . . . 5 |
10 | 5, 6, 9 | cbv3 1735 | . . . 4 |
11 | pm2.21 612 | . . . . 5 | |
12 | 11 | alimi 1448 | . . . 4 |
13 | 19.8a 1583 | . . . 4 | |
14 | 10, 12, 13 | 3syl 17 | . . 3 |
15 | 3, 14 | sylbir 134 | . 2 |
16 | 2, 15 | sylnbi 673 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wal 1346 wnf 1453 wex 1485 wsb 1755 |
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-in1 609 ax-in2 610 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-11 1499 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 |
This theorem depends on definitions: df-bi 116 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 |
This theorem is referenced by: modc 2062 |
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