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Theorem nfdisjw 5124
Description: Bound-variable hypothesis builder for disjoint collection. Version of nfdisj 5125 with a disjoint variable condition, which does not require ax-13 2372. (Contributed by Mario Carneiro, 14-Nov-2016.) Avoid ax-13 2372. (Revised by Gino Giotto, 26-Jan-2024.)
Hypotheses
Ref Expression
nfdisjw.1 𝑦𝐴
nfdisjw.2 𝑦𝐵
Assertion
Ref Expression
nfdisjw 𝑦Disj 𝑥𝐴 𝐵
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)

Proof of Theorem nfdisjw
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 dfdisj2 5114 . 2 (Disj 𝑥𝐴 𝐵 ↔ ∀𝑧∃*𝑥(𝑥𝐴𝑧𝐵))
2 nftru 1807 . . . . 5 𝑥
3 nfcvd 2905 . . . . . . 7 (⊤ → 𝑦𝑥)
4 nfdisjw.1 . . . . . . . 8 𝑦𝐴
54a1i 11 . . . . . . 7 (⊤ → 𝑦𝐴)
63, 5nfeld 2915 . . . . . 6 (⊤ → Ⅎ𝑦 𝑥𝐴)
7 nfdisjw.2 . . . . . . . 8 𝑦𝐵
87nfcri 2891 . . . . . . 7 𝑦 𝑧𝐵
98a1i 11 . . . . . 6 (⊤ → Ⅎ𝑦 𝑧𝐵)
106, 9nfand 1901 . . . . 5 (⊤ → Ⅎ𝑦(𝑥𝐴𝑧𝐵))
112, 10nfmodv 2554 . . . 4 (⊤ → Ⅎ𝑦∃*𝑥(𝑥𝐴𝑧𝐵))
1211mptru 1549 . . 3 𝑦∃*𝑥(𝑥𝐴𝑧𝐵)
1312nfal 2317 . 2 𝑦𝑧∃*𝑥(𝑥𝐴𝑧𝐵)
141, 13nfxfr 1856 1 𝑦Disj 𝑥𝐴 𝐵
Colors of variables: wff setvar class
Syntax hints:  wa 397  wal 1540  wtru 1543  wnf 1786  wcel 2107  ∃*wmo 2533  wnfc 2884  Disj wdisj 5112
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-tru 1545  df-ex 1783  df-nf 1787  df-mo 2535  df-cleq 2725  df-clel 2811  df-nfc 2886  df-rmo 3377  df-disj 5113
This theorem is referenced by:  disjxiun  5144
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