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Mirrors > Home > ILE Home > Th. List > tpssi | Unicode version |
Description: A triple of elements of a class is a subset of the class. (Contributed by Alexander van der Vekens, 1-Feb-2018.) |
Ref | Expression |
---|---|
tpssi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-tp 3569 | . 2 | |
2 | prssi 3716 | . . . 4 | |
3 | 2 | 3adant3 1002 | . . 3 |
4 | snssi 3702 | . . . 4 | |
5 | 4 | 3ad2ant3 1005 | . . 3 |
6 | 3, 5 | unssd 3284 | . 2 |
7 | 1, 6 | eqsstrid 3174 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 w3a 963 wcel 2128 cun 3100 wss 3102 csn 3561 cpr 3562 ctp 3563 |
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 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-ext 2139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1338 df-nf 1441 df-sb 1743 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-v 2714 df-un 3106 df-in 3108 df-ss 3115 df-sn 3567 df-pr 3568 df-tp 3569 |
This theorem is referenced by: (None) |
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