Theorem f1ofo 5153

Description: A one-to-one onto function is an onto function. (Contributed by NM, 28-Apr-2004.)

Assertion

Ref	Expression
f1ofo	⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵)

Proof of Theorem f1ofo

Step	Hyp	Ref	Expression
1		dff1o3 5152	. 2 ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹:𝐴–onto→𝐵 ∧ Fun ◡𝐹))
2	1	simplbi 268	1 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵)

Syntax hints:   → wi 4  ^◡ccnv 4362  Fun wfun 4916  –onto→wfo 4920  –1-1-onto→wf1o 4921

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-11 1437  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-3an 921  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-in 2979  df-ss 2986  df-f 4926  df-f1 4927  df-fo 4928  df-f1o 4929

This theorem is referenced by:  f1imacnv  5163  f1ococnv2  5173  fo00  5182  isoini  5477  isoselem  5479  f1opw2  5726  f1dmex  5763  bren  6251  f1oeng  6260  en1  6302  phplem4  6341  phplem4on  6353  dif1en  6364  supisolem  6421  ordiso2  6446  1fv  9149