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Theorem f1o0 6873
Description: One-to-one onto mapping of the empty set. (Contributed by NM, 10-Sep-2004.)
Assertion
Ref Expression
f1o0 ∅:∅–1-1-onto→∅

Proof of Theorem f1o0
StepHypRef Expression
1 eqid 2763 . 2 ∅ = ∅
2 f1o00 6871 . 2 (∅:∅–1-1-onto→∅ ↔ (∅ = ∅ ∧ ∅ = ∅))
31, 1, 2mpbir2an 724 1 ∅:∅–1-1-onto→∅
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1569  ∅c0 4281  –1-1-onto→wf1o 6546
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2101  df-mo 2567  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-fun 6549  df-fn 6550  df-f 6551  df-f1 6552  df-fo 6553  df-f1o 6554
This theorem is used by:  en0  9059  en0r  9061  brwdom2  9580  cnfcom  9714  ackbij2lem2  10330  eupth0  30830  f1ocnt  33448  1arithidom  34125  iso0  45437
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