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Mirrors > Home > ILE Home > Th. List > prss | Unicode version |
Description: A pair of elements of a class is a subset of the class. Theorem 7.5 of [Quine] p. 49. (Contributed by NM, 30-May-1994.) (Proof shortened by Andrew Salmon, 29-Jun-2011.) |
Ref | Expression |
---|---|
prss.1 | |
prss.2 |
Ref | Expression |
---|---|
prss |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unss 3117 | . 2 | |
2 | prss.1 | . . . 4 | |
3 | 2 | snss 3494 | . . 3 |
4 | prss.2 | . . . 4 | |
5 | 4 | snss 3494 | . . 3 |
6 | 3, 5 | anbi12i 433 | . 2 |
7 | df-pr 3382 | . . 3 | |
8 | 7 | sseq1i 2969 | . 2 |
9 | 1, 6, 8 | 3bitr4i 201 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 97 wb 98 wcel 1393 cvv 2557 cun 2915 wss 2917 csn 3375 cpr 3376 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-sn 3381 df-pr 3382 |
This theorem is referenced by: tpss 3529 prsspw 3536 |
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