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Theorem reurexprg 4729
Description: Convert a restricted existential uniqueness over a pair to a restricted existential quantification and an implication . (Contributed by AV, 3-Apr-2023.)
Hypotheses
Ref Expression
reuprg.1 (𝑥 = 𝐴 → (𝜑𝜓))
reuprg.2 (𝑥 = 𝐵 → (𝜑𝜒))
Assertion
Ref Expression
reurexprg ((𝐴𝑉𝐵𝑊) → (∃!𝑥 ∈ {𝐴, 𝐵}𝜑 ↔ (∃𝑥 ∈ {𝐴, 𝐵}𝜑 ∧ ((𝜒𝜓) → 𝐴 = 𝐵))))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝜓,𝑥   𝜒,𝑥
Allowed substitution hints:   𝜑(𝑥)   𝑉(𝑥)   𝑊(𝑥)

Proof of Theorem reurexprg
StepHypRef Expression
1 reuprg.1 . . 3 (𝑥 = 𝐴 → (𝜑𝜓))
2 reuprg.2 . . 3 (𝑥 = 𝐵 → (𝜑𝜒))
31, 2reuprg 4728 . 2 ((𝐴𝑉𝐵𝑊) → (∃!𝑥 ∈ {𝐴, 𝐵}𝜑 ↔ ((𝜓𝜒) ∧ ((𝜒𝜓) → 𝐴 = 𝐵))))
41, 2rexprg 4721 . . . 4 ((𝐴𝑉𝐵𝑊) → (∃𝑥 ∈ {𝐴, 𝐵}𝜑 ↔ (𝜓𝜒)))
54bicomd 223 . . 3 ((𝐴𝑉𝐵𝑊) → ((𝜓𝜒) ↔ ∃𝑥 ∈ {𝐴, 𝐵}𝜑))
65anbi1d 630 . 2 ((𝐴𝑉𝐵𝑊) → (((𝜓𝜒) ∧ ((𝜒𝜓) → 𝐴 = 𝐵)) ↔ (∃𝑥 ∈ {𝐴, 𝐵}𝜑 ∧ ((𝜒𝜓) → 𝐴 = 𝐵))))
73, 6bitrd 279 1 ((𝐴𝑉𝐵𝑊) → (∃!𝑥 ∈ {𝐴, 𝐵}𝜑 ↔ (∃𝑥 ∈ {𝐴, 𝐵}𝜑 ∧ ((𝜒𝜓) → 𝐴 = 𝐵))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  wo 846   = wceq 1537  wcel 2103  wrex 3072  ∃!wreu 3381  {cpr 4650
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2105  ax-9 2113  ax-10 2136  ax-11 2153  ax-12 2173  ax-ext 2705
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2726  df-clel 2813  df-nfc 2890  df-ral 3064  df-rex 3073  df-rmo 3383  df-reu 3384  df-v 3484  df-sbc 3799  df-un 3975  df-sn 4649  df-pr 4651
This theorem is referenced by: (None)
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