Users' Mathboxes Mathbox for Alexander van der Vekens < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  prsprel Structured version   Visualization version   GIF version

Theorem prsprel 47474
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 47471 . . 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 2829 . . . . . . . . . . . . 13 (𝑎 = 𝑋 → (𝑎𝑉𝑋𝑉))
43eqcoms 2745 . . . . . . . . . . . 12 (𝑋 = 𝑎 → (𝑎𝑉𝑋𝑉))
5 eleq1 2829 . . . . . . . . . . . . 13 (𝑏 = 𝑌 → (𝑏𝑉𝑌𝑉))
65eqcoms 2745 . . . . . . . . . . . 12 (𝑌 = 𝑏 → (𝑏𝑉𝑌𝑉))
74, 6bi2anan9 638 . . . . . . . . . . 11 ((𝑋 = 𝑎𝑌 = 𝑏) → ((𝑎𝑉𝑏𝑉) ↔ (𝑋𝑉𝑌𝑉)))
87biimpd 229 . . . . . . . . . 10 ((𝑋 = 𝑎𝑌 = 𝑏) → ((𝑎𝑉𝑏𝑉) → (𝑋𝑉𝑌𝑉)))
9 eleq1 2829 . . . . . . . . . . . . . 14 (𝑏 = 𝑋 → (𝑏𝑉𝑋𝑉))
109eqcoms 2745 . . . . . . . . . . . . 13 (𝑋 = 𝑏 → (𝑏𝑉𝑋𝑉))
11 eleq1 2829 . . . . . . . . . . . . . 14 (𝑎 = 𝑌 → (𝑎𝑉𝑌𝑉))
1211eqcoms 2745 . . . . . . . . . . . . 13 (𝑌 = 𝑎 → (𝑎𝑉𝑌𝑉))
1310, 12bi2anan9 638 . . . . . . . . . . . 12 ((𝑋 = 𝑏𝑌 = 𝑎) → ((𝑏𝑉𝑎𝑉) ↔ (𝑋𝑉𝑌𝑉)))
1413biimpd 229 . . . . . . . . . . 11 ((𝑋 = 𝑏𝑌 = 𝑎) → ((𝑏𝑉𝑎𝑉) → (𝑋𝑉𝑌𝑉)))
1514ancomsd 465 . . . . . . . . . 10 ((𝑋 = 𝑏𝑌 = 𝑎) → ((𝑎𝑉𝑏𝑉) → (𝑋𝑉𝑌𝑉)))
168, 15jaoi 858 . . . . . . . . 9 (((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎)) → ((𝑎𝑉𝑏𝑉) → (𝑋𝑉𝑌𝑉)))
1716com12 32 . . . . . . . 8 ((𝑎𝑉𝑏𝑉) → (((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎)) → (𝑋𝑉𝑌𝑉)))
1817adantl 481 . . . . . . 7 (((𝑋𝑈𝑌𝑊) ∧ (𝑎𝑉𝑏𝑉)) → (((𝑋 = 𝑎𝑌 = 𝑏) ∨ (𝑋 = 𝑏𝑌 = 𝑎)) → (𝑋𝑉𝑌𝑉)))
192, 18sylbid 240 . . . . . 6 (((𝑋𝑈𝑌𝑊) ∧ (𝑎𝑉𝑏𝑉)) → ({𝑋, 𝑌} = {𝑎, 𝑏} → (𝑋𝑉𝑌𝑉)))
2019expcom 413 . . . . 5 ((𝑎𝑉𝑏𝑉) → ((𝑋𝑈𝑌𝑊) → ({𝑋, 𝑌} = {𝑎, 𝑏} → (𝑋𝑉𝑌𝑉))))
2120com23 86 . . . 4 ((𝑎𝑉𝑏𝑉) → ({𝑋, 𝑌} = {𝑎, 𝑏} → ((𝑋𝑈𝑌𝑊) → (𝑋𝑉𝑌𝑉))))
2221rexlimivv 3201 . . 3 (∃𝑎𝑉𝑏𝑉 {𝑋, 𝑌} = {𝑎, 𝑏} → ((𝑋𝑈𝑌𝑊) → (𝑋𝑉𝑌𝑉)))
231, 22syl 17 . 2 ({𝑋, 𝑌} ∈ (Pairs‘𝑉) → ((𝑋𝑈𝑌𝑊) → (𝑋𝑉𝑌𝑉)))
2423imp 406 1 (({𝑋, 𝑌} ∈ (Pairs‘𝑉) ∧ (𝑋𝑈𝑌𝑊)) → (𝑋𝑉𝑌𝑉))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wo 848   = wceq 1540  wcel 2108  wrex 3070  {cpr 4628  cfv 6561  Pairscspr 47464
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 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-rep 5279  ax-sep 5296  ax-nul 5306  ax-pr 5432  ax-un 7755
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3482  df-sbc 3789  df-csb 3900  df-dif 3954  df-un 3956  df-in 3958  df-ss 3968  df-nul 4334  df-if 4526  df-pw 4602  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-iun 4993  df-br 5144  df-opab 5206  df-mpt 5226  df-id 5578  df-xp 5691  df-rel 5692  df-cnv 5693  df-co 5694  df-dm 5695  df-iota 6514  df-fun 6563  df-fv 6569  df-spr 47465
This theorem is referenced by:  prsssprel  47475  sprsymrelfolem2  47480
  Copyright terms: Public domain W3C validator