Theorem f1o0 6646

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

Step	Hyp	Ref	Expression
1		eqid 2821	. 2 ⊢ ∅ = ∅
2		f1o00 6644	. 2 ⊢ (∅:∅–1-1-onto→∅ ↔ (∅ = ∅ ∧ ∅ = ∅))
3	1, 1, 2	mpbir2an 709	1 ⊢ ∅:∅–1-1-onto→∅

Syntax hints:   = wceq 1533  ∅c0 4291  –1-1-onto→wf1o 6349

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-sep 5196  ax-nul 5203  ax-pr 5322

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3497  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4562  df-pr 4564  df-op 4568  df-br 5060  df-opab 5122  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357

This theorem is referenced by:  brwdom2  9031  cnfcom  9157  ackbij2lem2  9656  eupth0  27987  f1ocnt  30519  iso0  40632