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Theorem prnebg 4857
Description: A (proper) pair is not equal to another (maybe improper) pair if and only if an element of the first pair is not contained in the second pair. (Contributed by Alexander van der Vekens, 16-Jan-2018.)
Assertion
Ref Expression
prnebg (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → (((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) ↔ {𝐴, 𝐵} ≠ {𝐶, 𝐷}))

Proof of Theorem prnebg
StepHypRef Expression
1 prneimg 4856 . . 3 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌)) → (((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) → {𝐴, 𝐵} ≠ {𝐶, 𝐷}))
213adant3 1133 . 2 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → (((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) → {𝐴, 𝐵} ≠ {𝐶, 𝐷}))
3 ioran 983 . . . . 5 (¬ ((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) ↔ (¬ (𝐴𝐶𝐴𝐷) ∧ ¬ (𝐵𝐶𝐵𝐷)))
4 ianor 981 . . . . . . 7 (¬ (𝐴𝐶𝐴𝐷) ↔ (¬ 𝐴𝐶 ∨ ¬ 𝐴𝐷))
5 nne 2945 . . . . . . . 8 𝐴𝐶𝐴 = 𝐶)
6 nne 2945 . . . . . . . 8 𝐴𝐷𝐴 = 𝐷)
75, 6orbi12i 914 . . . . . . 7 ((¬ 𝐴𝐶 ∨ ¬ 𝐴𝐷) ↔ (𝐴 = 𝐶𝐴 = 𝐷))
84, 7bitri 275 . . . . . 6 (¬ (𝐴𝐶𝐴𝐷) ↔ (𝐴 = 𝐶𝐴 = 𝐷))
9 ianor 981 . . . . . . 7 (¬ (𝐵𝐶𝐵𝐷) ↔ (¬ 𝐵𝐶 ∨ ¬ 𝐵𝐷))
10 nne 2945 . . . . . . . 8 𝐵𝐶𝐵 = 𝐶)
11 nne 2945 . . . . . . . 8 𝐵𝐷𝐵 = 𝐷)
1210, 11orbi12i 914 . . . . . . 7 ((¬ 𝐵𝐶 ∨ ¬ 𝐵𝐷) ↔ (𝐵 = 𝐶𝐵 = 𝐷))
139, 12bitri 275 . . . . . 6 (¬ (𝐵𝐶𝐵𝐷) ↔ (𝐵 = 𝐶𝐵 = 𝐷))
148, 13anbi12i 628 . . . . 5 ((¬ (𝐴𝐶𝐴𝐷) ∧ ¬ (𝐵𝐶𝐵𝐷)) ↔ ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)))
153, 14bitri 275 . . . 4 (¬ ((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) ↔ ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)))
16 anddi 1010 . . . . 5 (((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)) ↔ (((𝐴 = 𝐶𝐵 = 𝐶) ∨ (𝐴 = 𝐶𝐵 = 𝐷)) ∨ ((𝐴 = 𝐷𝐵 = 𝐶) ∨ (𝐴 = 𝐷𝐵 = 𝐷))))
17 eqtr3 2759 . . . . . . . . . 10 ((𝐴 = 𝐶𝐵 = 𝐶) → 𝐴 = 𝐵)
18 eqneqall 2952 . . . . . . . . . 10 (𝐴 = 𝐵 → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
1917, 18syl 17 . . . . . . . . 9 ((𝐴 = 𝐶𝐵 = 𝐶) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
20 preq12 4740 . . . . . . . . . 10 ((𝐴 = 𝐶𝐵 = 𝐷) → {𝐴, 𝐵} = {𝐶, 𝐷})
2120a1d 25 . . . . . . . . 9 ((𝐴 = 𝐶𝐵 = 𝐷) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
2219, 21jaoi 856 . . . . . . . 8 (((𝐴 = 𝐶𝐵 = 𝐶) ∨ (𝐴 = 𝐶𝐵 = 𝐷)) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
23 preq12 4740 . . . . . . . . . . 11 ((𝐴 = 𝐷𝐵 = 𝐶) → {𝐴, 𝐵} = {𝐷, 𝐶})
24 prcom 4737 . . . . . . . . . . 11 {𝐷, 𝐶} = {𝐶, 𝐷}
2523, 24eqtrdi 2789 . . . . . . . . . 10 ((𝐴 = 𝐷𝐵 = 𝐶) → {𝐴, 𝐵} = {𝐶, 𝐷})
2625a1d 25 . . . . . . . . 9 ((𝐴 = 𝐷𝐵 = 𝐶) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
27 eqtr3 2759 . . . . . . . . . 10 ((𝐴 = 𝐷𝐵 = 𝐷) → 𝐴 = 𝐵)
2827, 18syl 17 . . . . . . . . 9 ((𝐴 = 𝐷𝐵 = 𝐷) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
2926, 28jaoi 856 . . . . . . . 8 (((𝐴 = 𝐷𝐵 = 𝐶) ∨ (𝐴 = 𝐷𝐵 = 𝐷)) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
3022, 29jaoi 856 . . . . . . 7 ((((𝐴 = 𝐶𝐵 = 𝐶) ∨ (𝐴 = 𝐶𝐵 = 𝐷)) ∨ ((𝐴 = 𝐷𝐵 = 𝐶) ∨ (𝐴 = 𝐷𝐵 = 𝐷))) → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
3130com12 32 . . . . . 6 (𝐴𝐵 → ((((𝐴 = 𝐶𝐵 = 𝐶) ∨ (𝐴 = 𝐶𝐵 = 𝐷)) ∨ ((𝐴 = 𝐷𝐵 = 𝐶) ∨ (𝐴 = 𝐷𝐵 = 𝐷))) → {𝐴, 𝐵} = {𝐶, 𝐷}))
32313ad2ant3 1136 . . . . 5 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → ((((𝐴 = 𝐶𝐵 = 𝐶) ∨ (𝐴 = 𝐶𝐵 = 𝐷)) ∨ ((𝐴 = 𝐷𝐵 = 𝐶) ∨ (𝐴 = 𝐷𝐵 = 𝐷))) → {𝐴, 𝐵} = {𝐶, 𝐷}))
3316, 32biimtrid 241 . . . 4 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → (((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)) → {𝐴, 𝐵} = {𝐶, 𝐷}))
3415, 33biimtrid 241 . . 3 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → (¬ ((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) → {𝐴, 𝐵} = {𝐶, 𝐷}))
3534necon1ad 2958 . 2 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → ({𝐴, 𝐵} ≠ {𝐶, 𝐷} → ((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷))))
362, 35impbid 211 1 (((𝐴𝑈𝐵𝑉) ∧ (𝐶𝑋𝐷𝑌) ∧ 𝐴𝐵) → (((𝐴𝐶𝐴𝐷) ∨ (𝐵𝐶𝐵𝐷)) ↔ {𝐴, 𝐵} ≠ {𝐶, 𝐷}))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 397  wo 846  w3a 1088   = wceq 1542  wcel 2107  wne 2941  {cpr 4631
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-ext 2704
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-ex 1783  df-sb 2069  df-clab 2711  df-cleq 2725  df-clel 2811  df-ne 2942  df-v 3477  df-un 3954  df-sn 4630  df-pr 4632
This theorem is referenced by:  zlmodzxznm  47178
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