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Theorem ensucne0 44102
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 6431 . . . 4 suc 𝐵 ≠ ∅
2 en0r 9001 . . . 4 (∅ ≈ suc 𝐵 ↔ suc 𝐵 = ∅)
31, 2nemtbir 3053 . . 3 ¬ ∅ ≈ suc 𝐵
4 breq1 5103 . . 3 (𝐴 = ∅ → (𝐴 ≈ suc 𝐵 ↔ ∅ ≈ suc 𝐵))
53, 4mtbiri 329 . 2 (𝐴 = ∅ → ¬ 𝐴 ≈ suc 𝐵)
65necon2ai 2986 1 (𝐴 ≈ suc 𝐵𝐴 ≠ ∅)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1560  wne 2957  c0 4285   class class class wbr 5100  suc csuc 6348  cen 8924
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-ext 2734  ax-sep 5246  ax-nul 5256  ax-pr 5390
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-sb 2091  df-mo 2566  df-clab 2741  df-cleq 2754  df-clel 2837  df-ne 2958  df-ral 3077  df-rex 3087  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-id 5542  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-dm 5657  df-rn 5658  df-suc 6352  df-fun 6523  df-fn 6524  df-f 6525  df-f1 6526  df-fo 6527  df-f1o 6528  df-en 8928
This theorem is referenced by: (None)
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