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Mirrors > Home > ILE Home > Th. List > nssssr | Unicode version |
Description: Negation of subclass relationship. Compare nssr 3188. (Contributed by Jim Kingdon, 17-Sep-2018.) |
Ref | Expression |
---|---|
nssssr |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exanaliim 1627 | . 2 | |
2 | ssextss 4180 | . 2 | |
3 | 1, 2 | sylnibr 667 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 103 wal 1333 wex 1472 wss 3102 |
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 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-14 2131 ax-ext 2139 ax-sep 4082 ax-pow 4135 |
This theorem depends on definitions: df-bi 116 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-v 2714 df-in 3108 df-ss 3115 df-pw 3545 df-sn 3566 |
This theorem is referenced by: (None) |
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