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Theorem bj-intexr 13421
Description: intexr 4107 from bounded separation. (Contributed by BJ, 18-Nov-2019.) (Proof modification is discouraged.)
Assertion
Ref Expression
bj-intexr ( 𝐴 ∈ V → 𝐴 ≠ ∅)

Proof of Theorem bj-intexr
StepHypRef Expression
1 bj-vprc 13409 . . 3 ¬ V ∈ V
2 inteq 3806 . . . . 5 (𝐴 = ∅ → 𝐴 = ∅)
3 int0 3817 . . . . 5 ∅ = V
42, 3eqtrdi 2203 . . . 4 (𝐴 = ∅ → 𝐴 = V)
54eleq1d 2223 . . 3 (𝐴 = ∅ → ( 𝐴 ∈ V ↔ V ∈ V))
61, 5mtbiri 665 . 2 (𝐴 = ∅ → ¬ 𝐴 ∈ V)
76necon2ai 2378 1 ( 𝐴 ∈ V → 𝐴 ≠ ∅)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1332  wcel 2125  wne 2324  Vcvv 2709  c0 3390   cint 3803
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-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1481  ax-10 1482  ax-11 1483  ax-i12 1484  ax-bndl 1486  ax-4 1487  ax-17 1503  ax-i9 1507  ax-ial 1511  ax-i5r 1512  ax-13 2127  ax-14 2128  ax-ext 2136  ax-bdn 13330  ax-bdel 13334  ax-bdsep 13397
This theorem depends on definitions:  df-bi 116  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1740  df-clab 2141  df-cleq 2147  df-clel 2150  df-nfc 2285  df-ne 2325  df-ral 2437  df-v 2711  df-dif 3100  df-nul 3391  df-int 3804
This theorem is referenced by: (None)
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