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Mirrors > Home > MPE Home > Th. List > prss | Structured version Visualization version GIF 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.) (Proof shortened by JJ, 23-Jul-2021.) |
Ref | Expression |
---|---|
prss.1 | ⊢ 𝐴 ∈ V |
prss.2 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
prss | ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) ↔ {𝐴, 𝐵} ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prss.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | prss.2 | . 2 ⊢ 𝐵 ∈ V | |
3 | prssg 4751 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) ↔ {𝐴, 𝐵} ⊆ 𝐶)) | |
4 | 1, 2, 3 | mp2an 690 | 1 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) ↔ {𝐴, 𝐵} ⊆ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 ∈ wcel 2110 Vcvv 3494 ⊆ wss 3935 {cpr 4568 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-un 3940 df-in 3942 df-ss 3951 df-sn 4567 df-pr 4569 |
This theorem is referenced by: tpss 4767 uniintsn 4912 pwssun 5455 xpsspw 5681 dffv2 6755 fiint 8794 wunex2 10159 hashfun 13797 fun2dmnop0 13851 prdsle 16734 prdsless 16735 prdsleval 16749 pwsle 16764 acsfn2 16933 joinfval 17610 joindmss 17616 meetfval 17624 meetdmss 17630 clatl 17725 ipoval 17763 ipolerval 17765 eqgfval 18327 eqgval 18328 gaorb 18436 pmtrrn2 18587 efgcpbllema 18879 frgpuplem 18897 isnzr2hash 20036 ltbval 20251 ltbwe 20252 opsrle 20255 opsrtoslem1 20263 thlle 20840 isphtpc 23597 axlowdimlem4 26730 structgrssvtx 26808 structgrssiedg 26809 umgredg 26922 wlk1walk 27419 wlkonl1iedg 27446 wlkdlem2 27464 3wlkdlem6 27943 frcond2 28045 frcond3 28047 nfrgr2v 28050 frgr3vlem1 28051 frgr3vlem2 28052 2pthfrgrrn 28060 frgrncvvdeqlem2 28078 shincli 29138 chincli 29236 lsmsnorb 30945 coinfliprv 31740 altxpsspw 33438 mnurndlem1 40615 fourierdlem103 42493 fourierdlem104 42494 nnsum3primes4 43952 |
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