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| Mirrors > Home > ILE Home > Th. List > prssi | GIF version | ||
| Description: A pair of elements of a class is a subset of the class. (Contributed by NM, 16-Jan-2015.) |
| Ref | Expression |
|---|---|
| prssi | ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → {𝐴, 𝐵} ⊆ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prssg 3829 | . 2 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) ↔ {𝐴, 𝐵} ⊆ 𝐶)) | |
| 2 | 1 | ibi 176 | 1 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → {𝐴, 𝐵} ⊆ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2201 ⊆ wss 3199 {cpr 3669 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2212 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1810 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-v 2803 df-un 3203 df-in 3205 df-ss 3212 df-sn 3674 df-pr 3675 |
| This theorem is referenced by: prssd 3831 tpssi 3841 prelpwi 4305 onun2 4587 onintexmid 4670 nnregexmid 4718 rex2dom 6998 en2eqpr 7101 m1expcl2 10826 m1expcl 10827 minmax 11810 xrminmax 11845 1idssfct 12707 subrngin 14248 subrgin 14279 lssincl 14420 unopn 14755 umgrbien 15987 bdop 16528 012of 16650 isomninnlem 16696 trilpolemisumle 16704 trilpolemeq1 16706 trilpolemlt1 16707 iswomninnlem 16716 iswomni0 16718 ismkvnnlem 16719 nconstwlpolemgt0 16731 |
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