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Theorem ensucne0 42270
Description: A class equinumerous to a successor is never empty. (Contributed by RP, 11-Nov-2023.) (Proof shortened by SN, 16-Nov-2023.)
Assertion
Ref Expression
ensucne0 (𝐴 ≈ suc 𝐵𝐴 ≠ ∅)

Proof of Theorem ensucne0
StepHypRef Expression
1 nsuceq0 6447 . . . 4 suc 𝐵 ≠ ∅
2 en0r 9015 . . . 4 (∅ ≈ suc 𝐵 ↔ suc 𝐵 = ∅)
31, 2nemtbir 3038 . . 3 ¬ ∅ ≈ suc 𝐵
4 breq1 5151 . . 3 (𝐴 = ∅ → (𝐴 ≈ suc 𝐵 ↔ ∅ ≈ suc 𝐵))
53, 4mtbiri 326 . 2 (𝐴 = ∅ → ¬ 𝐴 ≈ suc 𝐵)
65necon2ai 2970 1 (𝐴 ≈ suc 𝐵𝐴 ≠ ∅)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1541  wne 2940  c0 4322   class class class wbr 5148  suc csuc 6366  cen 8935
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pr 5427
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-sb 2068  df-mo 2534  df-clab 2710  df-cleq 2724  df-clel 2810  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-sn 4629  df-pr 4631  df-op 4635  df-br 5149  df-opab 5211  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-suc 6370  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-en 8939
This theorem is referenced by: (None)
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