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Mirrors > Home > ILE Home > Th. List > prid2g | GIF version |
Description: An unordered pair contains its second member. Part of Theorem 7.6 of [Quine] p. 49. (Contributed by Stefan Allan, 8-Nov-2008.) |
Ref | Expression |
---|---|
prid2g | ⊢ (𝐵 ∈ 𝑉 → 𝐵 ∈ {𝐴, 𝐵}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prid1g 3622 | . 2 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ∈ {𝐵, 𝐴}) | |
2 | prcom 3594 | . 2 ⊢ {𝐵, 𝐴} = {𝐴, 𝐵} | |
3 | 1, 2 | eleqtrdi 2230 | 1 ⊢ (𝐵 ∈ 𝑉 → 𝐵 ∈ {𝐴, 𝐵}) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 1480 {cpr 3523 |
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 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-un 3070 df-sn 3528 df-pr 3529 |
This theorem is referenced by: en2lp 4464 en2eqpr 6794 maxleim 10970 maxabslemval 10973 xrmaxleim 11006 xrmaxiflemval 11012 xrmaxaddlem 11022 2stropg 12050 2strop1g 12053 coseq0negpitopi 12906 |
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