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Theorem prneimg 4854
Description: Two pairs are not equal if at least one element of the first pair is not contained in the second pair. (Contributed by Alexander van der Vekens, 13-Aug-2017.)
Assertion
Ref Expression
prneimg (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → (((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) → {𝐴, 𝐵} ≠ {𝐶, 𝐷}))

Proof of Theorem prneimg
StepHypRef Expression
1 preq12bg 4853 . . . . 5 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → ({𝐴, 𝐵} = {𝐶, 𝐷} ↔ ((𝐴 = 𝐶𝐵 = 𝐷) ∨ (𝐴 = 𝐷𝐵 = 𝐶))))
2 orddi 1006 . . . . . 6 (((𝐴 = 𝐶𝐵 = 𝐷) ∨ (𝐴 = 𝐷𝐵 = 𝐶)) ↔ (((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐴 = 𝐶𝐵 = 𝐶)) ∧ ((𝐵 = 𝐷𝐴 = 𝐷) ∧ (𝐵 = 𝐷𝐵 = 𝐶))))
3 simpll 763 . . . . . . 7 ((((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐴 = 𝐶𝐵 = 𝐶)) ∧ ((𝐵 = 𝐷𝐴 = 𝐷) ∧ (𝐵 = 𝐷𝐵 = 𝐶))) → (𝐴 = 𝐶𝐴 = 𝐷))
4 pm1.4 865 . . . . . . . 8 ((𝐵 = 𝐷𝐵 = 𝐶) → (𝐵 = 𝐶𝐵 = 𝐷))
54ad2antll 725 . . . . . . 7 ((((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐴 = 𝐶𝐵 = 𝐶)) ∧ ((𝐵 = 𝐷𝐴 = 𝐷) ∧ (𝐵 = 𝐷𝐵 = 𝐶))) → (𝐵 = 𝐶𝐵 = 𝐷))
63, 5jca 510 . . . . . 6 ((((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐴 = 𝐶𝐵 = 𝐶)) ∧ ((𝐵 = 𝐷𝐴 = 𝐷) ∧ (𝐵 = 𝐷𝐵 = 𝐶))) → ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)))
72, 6sylbi 216 . . . . 5 (((𝐴 = 𝐶𝐵 = 𝐷) ∨ (𝐴 = 𝐷𝐵 = 𝐶)) → ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)))
81, 7syl6bi 252 . . . 4 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → ({𝐴, 𝐵} = {𝐶, 𝐷} → ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷))))
9 ianor 978 . . . . . 6 (¬ (𝐴𝐶𝐴𝐷) ↔ (¬ 𝐴𝐶 ∨ ¬ 𝐴𝐷))
10 nne 2942 . . . . . . 7 𝐴𝐶𝐴 = 𝐶)
11 nne 2942 . . . . . . 7 𝐴𝐷𝐴 = 𝐷)
1210, 11orbi12i 911 . . . . . 6 ((¬ 𝐴𝐶 ∨ ¬ 𝐴𝐷) ↔ (𝐴 = 𝐶𝐴 = 𝐷))
139, 12bitr2i 275 . . . . 5 ((𝐴 = 𝐶𝐴 = 𝐷) ↔ ¬ (𝐴𝐶𝐴𝐷))
14 ianor 978 . . . . . 6 (¬ (𝐵𝐶𝐵𝐷) ↔ (¬ 𝐵𝐶 ∨ ¬ 𝐵𝐷))
15 nne 2942 . . . . . . 7 𝐵𝐶𝐵 = 𝐶)
16 nne 2942 . . . . . . 7 𝐵𝐷𝐵 = 𝐷)
1715, 16orbi12i 911 . . . . . 6 ((¬ 𝐵𝐶 ∨ ¬ 𝐵𝐷) ↔ (𝐵 = 𝐶𝐵 = 𝐷))
1814, 17bitr2i 275 . . . . 5 ((𝐵 = 𝐶𝐵 = 𝐷) ↔ ¬ (𝐵𝐶𝐵𝐷))
1913, 18anbi12i 625 . . . 4 (((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)) ↔ (¬ (𝐴𝐶𝐴𝐷) ∧ ¬ (𝐵𝐶𝐵𝐷)))
208, 19imbitrdi 250 . . 3 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → ({𝐴, 𝐵} = {𝐶, 𝐷} → (¬ (𝐴𝐶𝐴𝐷) ∧ ¬ (𝐵𝐶𝐵𝐷))))
21 pm4.56 985 . . 3 ((¬ (𝐴𝐶𝐴𝐷) ∧ ¬ (𝐵𝐶𝐵𝐷)) ↔ ¬ ((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)))
2220, 21imbitrdi 250 . 2 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → ({𝐴, 𝐵} = {𝐶, 𝐷} → ¬ ((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷))))
2322necon2ad 2953 1 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → (((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) → {𝐴, 𝐵} ≠ {𝐶, 𝐷}))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 394  wo 843   = wceq 1539  wcel 2104  wne 2938  {cpr 4629
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-ext 2701
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 844  df-3an 1087  df-tru 1542  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2722  df-clel 2808  df-ne 2939  df-v 3474  df-un 3952  df-sn 4628  df-pr 4630
This theorem is referenced by:  prnebg  4855  opthhausdorff  5516  symg2bas  19301  m2detleib  22353  umgrvad2edg  28737  usgrexmpldifpr  28782  zlmodzxzldeplem  47266  line2x  47527  inlinecirc02plem  47559
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