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Mirrors > Home > ILE Home > Th. List > unssin | Unicode version |
Description: Union as a subset of class complement and intersection (De Morgan's law). One direction of the definition of union in [Mendelson] p. 231. This would be an equality, rather than subset, in classical logic. (Contributed by Jim Kingdon, 25-Jul-2018.) |
Ref | Expression |
---|---|
unssin |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oranim 755 | . . . . 5 | |
2 | eldifn 3169 | . . . . . 6 | |
3 | eldifn 3169 | . . . . . 6 | |
4 | 2, 3 | anim12i 336 | . . . . 5 |
5 | 1, 4 | nsyl 602 | . . . 4 |
6 | elin 3229 | . . . 4 | |
7 | 5, 6 | sylnibr 651 | . . 3 |
8 | elun 3187 | . . 3 | |
9 | vex 2663 | . . . 4 | |
10 | eldif 3050 | . . . 4 | |
11 | 9, 10 | mpbiran 909 | . . 3 |
12 | 7, 8, 11 | 3imtr4i 200 | . 2 |
13 | 12 | ssriv 3071 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wa 103 wo 682 wcel 1465 cvv 2660 cdif 3038 cun 3039 cin 3040 wss 3041 |
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 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 |
This theorem depends on definitions: df-bi 116 df-tru 1319 df-nf 1422 df-sb 1721 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-v 2662 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 |
This theorem is referenced by: (None) |
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