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Theorem 2rmorex 2932
Description: Double restricted quantification with "at most one," analogous to 2moex 2100. (Contributed by Alexander van der Vekens, 17-Jun-2017.)
Assertion
Ref Expression
2rmorex (∃*𝑥𝐴𝑦𝐵 𝜑 → ∀𝑦𝐵 ∃*𝑥𝐴 𝜑)
Distinct variable groups:   𝑦,𝐴   𝑥,𝐵   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝐴(𝑥)   𝐵(𝑦)

Proof of Theorem 2rmorex
StepHypRef Expression
1 df-rex 2450 . . . . . . . 8 (∃𝑦𝐵 𝜑 ↔ ∃𝑦(𝑦𝐵𝜑))
21anbi2i 453 . . . . . . 7 ((𝑥𝐴 ∧ ∃𝑦𝐵 𝜑) ↔ (𝑥𝐴 ∧ ∃𝑦(𝑦𝐵𝜑)))
32mobii 2051 . . . . . 6 (∃*𝑥(𝑥𝐴 ∧ ∃𝑦𝐵 𝜑) ↔ ∃*𝑥(𝑥𝐴 ∧ ∃𝑦(𝑦𝐵𝜑)))
4 df-rmo 2452 . . . . . 6 (∃*𝑥𝐴𝑦𝐵 𝜑 ↔ ∃*𝑥(𝑥𝐴 ∧ ∃𝑦𝐵 𝜑))
5 19.42v 1894 . . . . . . 7 (∃𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ (𝑥𝐴 ∧ ∃𝑦(𝑦𝐵𝜑)))
65mobii 2051 . . . . . 6 (∃*𝑥𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ ∃*𝑥(𝑥𝐴 ∧ ∃𝑦(𝑦𝐵𝜑)))
73, 4, 63bitr4i 211 . . . . 5 (∃*𝑥𝐴𝑦𝐵 𝜑 ↔ ∃*𝑥𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)))
8 2moex 2100 . . . . 5 (∃*𝑥𝑦(𝑥𝐴 ∧ (𝑦𝐵𝜑)) → ∀𝑦∃*𝑥(𝑥𝐴 ∧ (𝑦𝐵𝜑)))
97, 8sylbi 120 . . . 4 (∃*𝑥𝐴𝑦𝐵 𝜑 → ∀𝑦∃*𝑥(𝑥𝐴 ∧ (𝑦𝐵𝜑)))
10 an12 551 . . . . . 6 ((𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ (𝑦𝐵 ∧ (𝑥𝐴𝜑)))
1110mobii 2051 . . . . 5 (∃*𝑥(𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ ∃*𝑥(𝑦𝐵 ∧ (𝑥𝐴𝜑)))
1211albii 1458 . . . 4 (∀𝑦∃*𝑥(𝑥𝐴 ∧ (𝑦𝐵𝜑)) ↔ ∀𝑦∃*𝑥(𝑦𝐵 ∧ (𝑥𝐴𝜑)))
139, 12sylib 121 . . 3 (∃*𝑥𝐴𝑦𝐵 𝜑 → ∀𝑦∃*𝑥(𝑦𝐵 ∧ (𝑥𝐴𝜑)))
14 moanimv 2089 . . . 4 (∃*𝑥(𝑦𝐵 ∧ (𝑥𝐴𝜑)) ↔ (𝑦𝐵 → ∃*𝑥(𝑥𝐴𝜑)))
1514albii 1458 . . 3 (∀𝑦∃*𝑥(𝑦𝐵 ∧ (𝑥𝐴𝜑)) ↔ ∀𝑦(𝑦𝐵 → ∃*𝑥(𝑥𝐴𝜑)))
1613, 15sylib 121 . 2 (∃*𝑥𝐴𝑦𝐵 𝜑 → ∀𝑦(𝑦𝐵 → ∃*𝑥(𝑥𝐴𝜑)))
17 df-ral 2449 . . 3 (∀𝑦𝐵 ∃*𝑥𝐴 𝜑 ↔ ∀𝑦(𝑦𝐵 → ∃*𝑥𝐴 𝜑))
18 df-rmo 2452 . . . . 5 (∃*𝑥𝐴 𝜑 ↔ ∃*𝑥(𝑥𝐴𝜑))
1918imbi2i 225 . . . 4 ((𝑦𝐵 → ∃*𝑥𝐴 𝜑) ↔ (𝑦𝐵 → ∃*𝑥(𝑥𝐴𝜑)))
2019albii 1458 . . 3 (∀𝑦(𝑦𝐵 → ∃*𝑥𝐴 𝜑) ↔ ∀𝑦(𝑦𝐵 → ∃*𝑥(𝑥𝐴𝜑)))
2117, 20bitri 183 . 2 (∀𝑦𝐵 ∃*𝑥𝐴 𝜑 ↔ ∀𝑦(𝑦𝐵 → ∃*𝑥(𝑥𝐴𝜑)))
2216, 21sylibr 133 1 (∃*𝑥𝐴𝑦𝐵 𝜑 → ∀𝑦𝐵 ∃*𝑥𝐴 𝜑)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wal 1341  wex 1480  ∃*wmo 2015  wcel 2136  wral 2444  wrex 2445  ∃*wrmo 2447
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523
This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-ral 2449  df-rex 2450  df-rmo 2452
This theorem is referenced by: (None)
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