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Theorem ssprsseq 4491
Description: A proper pair is a subset of a pair iff it is equal to the superset. (Contributed by AV, 26-Oct-2020.)
Assertion
Ref Expression
ssprsseq ((𝐴𝑉𝐵𝑊𝐴𝐵) → ({𝐴, 𝐵} ⊆ {𝐶, 𝐷} ↔ {𝐴, 𝐵} = {𝐶, 𝐷}))

Proof of Theorem ssprsseq
StepHypRef Expression
1 ssprss 4490 . . . 4 ((𝐴𝑉𝐵𝑊) → ({𝐴, 𝐵} ⊆ {𝐶, 𝐷} ↔ ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷))))
213adant3 1126 . . 3 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ({𝐴, 𝐵} ⊆ {𝐶, 𝐷} ↔ ((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷))))
3 eqneqall 2954 . . . . . . . 8 (𝐴 = 𝐵 → (𝐴𝐵 → {𝐴, 𝐵} = {𝐶, 𝐷}))
4 eqtr3 2792 . . . . . . . 8 ((𝐴 = 𝐶𝐵 = 𝐶) → 𝐴 = 𝐵)
53, 4syl11 33 . . . . . . 7 (𝐴𝐵 → ((𝐴 = 𝐶𝐵 = 𝐶) → {𝐴, 𝐵} = {𝐶, 𝐷}))
653ad2ant3 1129 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ((𝐴 = 𝐶𝐵 = 𝐶) → {𝐴, 𝐵} = {𝐶, 𝐷}))
76com12 32 . . . . 5 ((𝐴 = 𝐶𝐵 = 𝐶) → ((𝐴𝑉𝐵𝑊𝐴𝐵) → {𝐴, 𝐵} = {𝐶, 𝐷}))
8 preq12 4406 . . . . . . 7 ((𝐴 = 𝐷𝐵 = 𝐶) → {𝐴, 𝐵} = {𝐷, 𝐶})
9 prcom 4403 . . . . . . 7 {𝐷, 𝐶} = {𝐶, 𝐷}
108, 9syl6eq 2821 . . . . . 6 ((𝐴 = 𝐷𝐵 = 𝐶) → {𝐴, 𝐵} = {𝐶, 𝐷})
1110a1d 25 . . . . 5 ((𝐴 = 𝐷𝐵 = 𝐶) → ((𝐴𝑉𝐵𝑊𝐴𝐵) → {𝐴, 𝐵} = {𝐶, 𝐷}))
12 preq12 4406 . . . . . 6 ((𝐴 = 𝐶𝐵 = 𝐷) → {𝐴, 𝐵} = {𝐶, 𝐷})
1312a1d 25 . . . . 5 ((𝐴 = 𝐶𝐵 = 𝐷) → ((𝐴𝑉𝐵𝑊𝐴𝐵) → {𝐴, 𝐵} = {𝐶, 𝐷}))
14 eqtr3 2792 . . . . . . . 8 ((𝐴 = 𝐷𝐵 = 𝐷) → 𝐴 = 𝐵)
153, 14syl11 33 . . . . . . 7 (𝐴𝐵 → ((𝐴 = 𝐷𝐵 = 𝐷) → {𝐴, 𝐵} = {𝐶, 𝐷}))
16153ad2ant3 1129 . . . . . 6 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ((𝐴 = 𝐷𝐵 = 𝐷) → {𝐴, 𝐵} = {𝐶, 𝐷}))
1716com12 32 . . . . 5 ((𝐴 = 𝐷𝐵 = 𝐷) → ((𝐴𝑉𝐵𝑊𝐴𝐵) → {𝐴, 𝐵} = {𝐶, 𝐷}))
187, 11, 13, 17ccase 1022 . . . 4 (((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)) → ((𝐴𝑉𝐵𝑊𝐴𝐵) → {𝐴, 𝐵} = {𝐶, 𝐷}))
1918com12 32 . . 3 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (((𝐴 = 𝐶𝐴 = 𝐷) ∧ (𝐵 = 𝐶𝐵 = 𝐷)) → {𝐴, 𝐵} = {𝐶, 𝐷}))
202, 19sylbid 230 . 2 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ({𝐴, 𝐵} ⊆ {𝐶, 𝐷} → {𝐴, 𝐵} = {𝐶, 𝐷}))
21 eqimss 3806 . 2 ({𝐴, 𝐵} = {𝐶, 𝐷} → {𝐴, 𝐵} ⊆ {𝐶, 𝐷})
2220, 21impbid1 215 1 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ({𝐴, 𝐵} ⊆ {𝐶, 𝐷} ↔ {𝐴, 𝐵} = {𝐶, 𝐷}))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 382  wo 836  w3a 1071   = wceq 1631  wcel 2145  wne 2943  wss 3723  {cpr 4318
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 837  df-3an 1073  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ne 2944  df-v 3353  df-un 3728  df-in 3730  df-ss 3737  df-sn 4317  df-pr 4319
This theorem is referenced by:  upgredgpr  26259
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