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Theorem moxfr 36163
Description: Transfer at-most-one between related expressions. (Contributed by Stefan O'Rear, 12-Feb-2015.)
Hypotheses
Ref Expression
moxfr.a 𝐴 ∈ V
moxfr.b ∃!𝑦 𝑥 = 𝐴
moxfr.c (𝑥 = 𝐴 → (𝜑𝜓))
Assertion
Ref Expression
moxfr (∃*𝑥𝜑 ↔ ∃*𝑦𝜓)
Distinct variable groups:   𝜓,𝑥   𝜑,𝑦   𝑥,𝐴   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑦)   𝐴(𝑦)

Proof of Theorem moxfr
StepHypRef Expression
1 moxfr.a . . . . . 6 𝐴 ∈ V
21a1i 11 . . . . 5 (𝑦 ∈ V → 𝐴 ∈ V)
3 moxfr.b . . . . . . . 8 ∃!𝑦 𝑥 = 𝐴
4 euex 2386 . . . . . . . 8 (∃!𝑦 𝑥 = 𝐴 → ∃𝑦 𝑥 = 𝐴)
53, 4ax-mp 5 . . . . . . 7 𝑦 𝑥 = 𝐴
6 rexv 3097 . . . . . . 7 (∃𝑦 ∈ V 𝑥 = 𝐴 ↔ ∃𝑦 𝑥 = 𝐴)
75, 6mpbir 219 . . . . . 6 𝑦 ∈ V 𝑥 = 𝐴
87a1i 11 . . . . 5 (𝑥 ∈ V → ∃𝑦 ∈ V 𝑥 = 𝐴)
9 moxfr.c . . . . 5 (𝑥 = 𝐴 → (𝜑𝜓))
102, 8, 9rexxfr 4713 . . . 4 (∃𝑥 ∈ V 𝜑 ↔ ∃𝑦 ∈ V 𝜓)
11 rexv 3097 . . . 4 (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑)
12 rexv 3097 . . . 4 (∃𝑦 ∈ V 𝜓 ↔ ∃𝑦𝜓)
1310, 11, 123bitr3i 288 . . 3 (∃𝑥𝜑 ↔ ∃𝑦𝜓)
141, 3, 9euxfr 3263 . . 3 (∃!𝑥𝜑 ↔ ∃!𝑦𝜓)
1513, 14imbi12i 338 . 2 ((∃𝑥𝜑 → ∃!𝑥𝜑) ↔ (∃𝑦𝜓 → ∃!𝑦𝜓))
16 df-mo 2367 . 2 (∃*𝑥𝜑 ↔ (∃𝑥𝜑 → ∃!𝑥𝜑))
17 df-mo 2367 . 2 (∃*𝑦𝜓 ↔ (∃𝑦𝜓 → ∃!𝑦𝜓))
1815, 16, 173bitr4i 290 1 (∃*𝑥𝜑 ↔ ∃*𝑦𝜓)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 194   = wceq 1474  wex 1694  wcel 1938  ∃!weu 2362  ∃*wmo 2363  wrex 2801  Vcvv 3077
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1700  ax-4 1713  ax-5 1793  ax-6 1838  ax-7 1885  ax-10 1966  ax-11 1971  ax-12 1983  ax-13 2137  ax-ext 2494
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-tru 1477  df-ex 1695  df-nf 1699  df-sb 1831  df-eu 2366  df-mo 2367  df-clab 2501  df-cleq 2507  df-clel 2510  df-nfc 2644  df-ral 2805  df-rex 2806  df-v 3079
This theorem is referenced by: (None)
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