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Theorem prsprel 46453
Description: The elements of a pair from the set of all unordered pairs over a given set 𝑉 are elements of the set 𝑉. (Contributed by AV, 22-Nov-2021.)
Assertion
Ref Expression
prsprel (({𝑋, 𝑌} ∈ (Pairs‘𝑉) ∧ (𝑋𝑈𝑌𝑊)) → (𝑋𝑉𝑌𝑉))

Proof of Theorem prsprel
Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 sprel 46450 . . 3 ({𝑋, 𝑌} ∈ (Pairs‘𝑉) → ∃𝑎𝑉𝑏𝑉 {𝑋, 𝑌} = {𝑎, 𝑏})
2 preq12bg 4853 . . . . . . 7 (((𝑋𝑈𝑌𝑊) ∧ (𝑎𝑉𝑏𝑉)) → ({𝑋, 𝑌} = {𝑎, 𝑏} ↔ ((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎))))
3 eleq1 2819 . . . . . . . . . . . . 13 (𝑎 = 𝑋 → (𝑎𝑉𝑋𝑉))
43eqcoms 2738 . . . . . . . . . . . 12 (𝑋 = 𝑎 → (𝑎𝑉𝑋𝑉))
5 eleq1 2819 . . . . . . . . . . . . 13 (𝑏 = 𝑌 → (𝑏𝑉𝑌𝑉))
65eqcoms 2738 . . . . . . . . . . . 12 (𝑌 = 𝑏 → (𝑏𝑉𝑌𝑉))
74, 6bi2anan9 635 . . . . . . . . . . 11 ((𝑋 = 𝑎𝑌 = 𝑏) → ((𝑎𝑉𝑏𝑉) ↔ (𝑋𝑉𝑌𝑉)))
87biimpd 228 . . . . . . . . . 10 ((𝑋 = 𝑎𝑌 = 𝑏) → ((𝑎𝑉𝑏𝑉) → (𝑋𝑉𝑌𝑉)))
9 eleq1 2819 . . . . . . . . . . . . . 14 (𝑏 = 𝑋 → (𝑏𝑉𝑋𝑉))
109eqcoms 2738 . . . . . . . . . . . . 13 (𝑋 = 𝑏 → (𝑏𝑉𝑋𝑉))
11 eleq1 2819 . . . . . . . . . . . . . 14 (𝑎 = 𝑌 → (𝑎𝑉𝑌𝑉))
1211eqcoms 2738 . . . . . . . . . . . . 13 (𝑌 = 𝑎 → (𝑎𝑉𝑌𝑉))
1310, 12bi2anan9 635 . . . . . . . . . . . 12 ((𝑋 = 𝑏𝑌 = 𝑎) → ((𝑏𝑉𝑎𝑉) ↔ (𝑋𝑉𝑌𝑉)))
1413biimpd 228 . . . . . . . . . . 11 ((𝑋 = 𝑏𝑌 = 𝑎) → ((𝑏𝑉𝑎𝑉) → (𝑋𝑉𝑌𝑉)))
1514ancomsd 464 . . . . . . . . . 10 ((𝑋 = 𝑏𝑌 = 𝑎) → ((𝑎𝑉𝑏𝑉) → (𝑋𝑉𝑌𝑉)))
168, 15jaoi 853 . . . . . . . . 9 (((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎)) → ((𝑎𝑉𝑏𝑉) → (𝑋𝑉𝑌𝑉)))
1716com12 32 . . . . . . . 8 ((𝑎𝑉𝑏𝑉) → (((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎)) → (𝑋𝑉𝑌𝑉)))
1817adantl 480 . . . . . . 7 (((𝑋𝑈𝑌𝑊) ∧ (𝑎𝑉𝑏𝑉)) → (((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎)) → (𝑋𝑉𝑌𝑉)))
192, 18sylbid 239 . . . . . 6 (((𝑋𝑈𝑌𝑊) ∧ (𝑎𝑉𝑏𝑉)) → ({𝑋, 𝑌} = {𝑎, 𝑏} → (𝑋𝑉𝑌𝑉)))
2019expcom 412 . . . . 5 ((𝑎𝑉𝑏𝑉) → ((𝑋𝑈𝑌𝑊) → ({𝑋, 𝑌} = {𝑎, 𝑏} → (𝑋𝑉𝑌𝑉))))
2120com23 86 . . . 4 ((𝑎𝑉𝑏𝑉) → ({𝑋, 𝑌} = {𝑎, 𝑏} → ((𝑋𝑈𝑌𝑊) → (𝑋𝑉𝑌𝑉))))
2221rexlimivv 3197 . . 3 (∃𝑎𝑉𝑏𝑉 {𝑋, 𝑌} = {𝑎, 𝑏} → ((𝑋𝑈𝑌𝑊) → (𝑋𝑉𝑌𝑉)))
231, 22syl 17 . 2 ({𝑋, 𝑌} ∈ (Pairs‘𝑉) → ((𝑋𝑈𝑌𝑊) → (𝑋𝑉𝑌𝑉)))
2423imp 405 1 (({𝑋, 𝑌} ∈ (Pairs‘𝑉) ∧ (𝑋𝑈𝑌𝑊)) → (𝑋𝑉𝑌𝑉))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 394  wo 843   = wceq 1539  wcel 2104  wrex 3068  {cpr 4629  cfv 6542  Pairscspr 46443
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1911  ax-6 1969  ax-7 2009  ax-8 2106  ax-9 2114  ax-10 2135  ax-11 2152  ax-12 2169  ax-ext 2701  ax-rep 5284  ax-sep 5298  ax-nul 5305  ax-pr 5426  ax-un 7727
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2532  df-eu 2561  df-clab 2708  df-cleq 2722  df-clel 2808  df-nfc 2883  df-ral 3060  df-rex 3069  df-rab 3431  df-v 3474  df-sbc 3777  df-csb 3893  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4322  df-if 4528  df-pw 4603  df-sn 4628  df-pr 4630  df-op 4634  df-uni 4908  df-iun 4998  df-br 5148  df-opab 5210  df-mpt 5231  df-id 5573  df-xp 5681  df-rel 5682  df-cnv 5683  df-co 5684  df-dm 5685  df-iota 6494  df-fun 6544  df-fv 6550  df-spr 46444
This theorem is referenced by:  prsssprel  46454  sprsymrelfolem2  46459
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