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Theorem en2i 8146
 Description: Equinumerosity inference from an implicit one-to-one onto function. (Contributed by NM, 4-Jan-2004.)
Hypotheses
Ref Expression
en2i.1 𝐴 ∈ V
en2i.2 𝐵 ∈ V
en2i.3 (𝑥𝐴𝐶 ∈ V)
en2i.4 (𝑦𝐵𝐷 ∈ V)
en2i.5 ((𝑥𝐴𝑦 = 𝐶) ↔ (𝑦𝐵𝑥 = 𝐷))
Assertion
Ref Expression
en2i 𝐴𝐵
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑦,𝐶   𝑥,𝐷
Allowed substitution hints:   𝐶(𝑥)   𝐷(𝑦)

Proof of Theorem en2i
StepHypRef Expression
1 en2i.1 . . . 4 𝐴 ∈ V
21a1i 11 . . 3 (⊤ → 𝐴 ∈ V)
3 en2i.2 . . . 4 𝐵 ∈ V
43a1i 11 . . 3 (⊤ → 𝐵 ∈ V)
5 en2i.3 . . . 4 (𝑥𝐴𝐶 ∈ V)
65a1i 11 . . 3 (⊤ → (𝑥𝐴𝐶 ∈ V))
7 en2i.4 . . . 4 (𝑦𝐵𝐷 ∈ V)
87a1i 11 . . 3 (⊤ → (𝑦𝐵𝐷 ∈ V))
9 en2i.5 . . . 4 ((𝑥𝐴𝑦 = 𝐶) ↔ (𝑦𝐵𝑥 = 𝐷))
109a1i 11 . . 3 (⊤ → ((𝑥𝐴𝑦 = 𝐶) ↔ (𝑦𝐵𝑥 = 𝐷)))
112, 4, 6, 8, 10en2d 8144 . 2 (⊤ → 𝐴𝐵)
1211trud 1640 1 𝐴𝐵
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 382   = wceq 1630  ⊤wtru 1631   ∈ wcel 2144  Vcvv 3349   class class class wbr 4784   ≈ cen 8105 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-8 2146  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-sep 4912  ax-nul 4920  ax-pow 4971  ax-pr 5034  ax-un 7095 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ral 3065  df-rex 3066  df-rab 3069  df-v 3351  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-pw 4297  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-br 4785  df-opab 4845  df-mpt 4862  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-en 8109 This theorem is referenced by:  xpsnen  8199  xpassen  8209
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