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Theorem rmoanim 40513
Description: Introduction of a conjunct into restricted "at most one" quantifier, analogous to moanim 2528. (Contributed by Alexander van der Vekens, 25-Jun-2017.)
Hypothesis
Ref Expression
rmoanim.1 𝑥𝜑
Assertion
Ref Expression
rmoanim (∃*𝑥𝐴 (𝜑𝜓) ↔ (𝜑 → ∃*𝑥𝐴 𝜓))
Distinct variable group:   𝑥,𝐴
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑥)

Proof of Theorem rmoanim
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 impexp 462 . . . . 5 (((𝜑𝜓) → 𝑥 = 𝑦) ↔ (𝜑 → (𝜓𝑥 = 𝑦)))
21ralbii 2976 . . . 4 (∀𝑥𝐴 ((𝜑𝜓) → 𝑥 = 𝑦) ↔ ∀𝑥𝐴 (𝜑 → (𝜓𝑥 = 𝑦)))
3 rmoanim.1 . . . . 5 𝑥𝜑
43r19.21 2952 . . . 4 (∀𝑥𝐴 (𝜑 → (𝜓𝑥 = 𝑦)) ↔ (𝜑 → ∀𝑥𝐴 (𝜓𝑥 = 𝑦)))
52, 4bitri 264 . . 3 (∀𝑥𝐴 ((𝜑𝜓) → 𝑥 = 𝑦) ↔ (𝜑 → ∀𝑥𝐴 (𝜓𝑥 = 𝑦)))
65exbii 1771 . 2 (∃𝑦𝑥𝐴 ((𝜑𝜓) → 𝑥 = 𝑦) ↔ ∃𝑦(𝜑 → ∀𝑥𝐴 (𝜓𝑥 = 𝑦)))
7 nfv 1840 . . 3 𝑦(𝜑𝜓)
87rmo2 3512 . 2 (∃*𝑥𝐴 (𝜑𝜓) ↔ ∃𝑦𝑥𝐴 ((𝜑𝜓) → 𝑥 = 𝑦))
9 nfv 1840 . . . . 5 𝑦𝜓
109rmo2 3512 . . . 4 (∃*𝑥𝐴 𝜓 ↔ ∃𝑦𝑥𝐴 (𝜓𝑥 = 𝑦))
1110imbi2i 326 . . 3 ((𝜑 → ∃*𝑥𝐴 𝜓) ↔ (𝜑 → ∃𝑦𝑥𝐴 (𝜓𝑥 = 𝑦)))
12 19.37v 1907 . . 3 (∃𝑦(𝜑 → ∀𝑥𝐴 (𝜓𝑥 = 𝑦)) ↔ (𝜑 → ∃𝑦𝑥𝐴 (𝜓𝑥 = 𝑦)))
1311, 12bitr4i 267 . 2 ((𝜑 → ∃*𝑥𝐴 𝜓) ↔ ∃𝑦(𝜑 → ∀𝑥𝐴 (𝜓𝑥 = 𝑦)))
146, 8, 133bitr4i 292 1 (∃*𝑥𝐴 (𝜑𝜓) ↔ (𝜑 → ∃*𝑥𝐴 𝜓))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384  wex 1701  wnf 1705  wral 2908  ∃*wrmo 2911
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1483  df-ex 1702  df-nf 1707  df-eu 2473  df-mo 2474  df-ral 2913  df-rmo 2916
This theorem is referenced by:  2reu1  40520
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