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Theorem nfdisjv 3757
Description: Bound-variable hypothesis builder for disjoint collection. (Contributed by Jim Kingdon, 19-Aug-2018.)
Hypotheses
Ref Expression
nfdisjv.1 𝑦𝐴
nfdisjv.2 𝑦𝐵
Assertion
Ref Expression
nfdisjv 𝑦Disj 𝑥𝐴 𝐵
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)

Proof of Theorem nfdisjv
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 dfdisj2 3747 . 2 (Disj 𝑥𝐴 𝐵 ↔ ∀𝑧∃*𝑥(𝑥𝐴𝑧𝐵))
2 nfcv 2178 . . . . . 6 𝑦𝑥
3 nfdisjv.1 . . . . . 6 𝑦𝐴
42, 3nfel 2186 . . . . 5 𝑦 𝑥𝐴
5 nfdisjv.2 . . . . . 6 𝑦𝐵
65nfcri 2172 . . . . 5 𝑦 𝑧𝐵
74, 6nfan 1457 . . . 4 𝑦(𝑥𝐴𝑧𝐵)
87nfmo 1920 . . 3 𝑦∃*𝑥(𝑥𝐴𝑧𝐵)
98nfal 1468 . 2 𝑦𝑧∃*𝑥(𝑥𝐴𝑧𝐵)
101, 9nfxfr 1363 1 𝑦Disj 𝑥𝐴 𝐵
Colors of variables: wff set class
Syntax hints:  wa 97  wal 1241  wnf 1349  wcel 1393  ∃*wmo 1901  wnfc 2165  Disj wdisj 3745
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-cleq 2033  df-clel 2036  df-nfc 2167  df-rmo 2314  df-disj 3746
This theorem is referenced by: (None)
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