Theorem f1ovi 6861

Description: The identity relation is a one-to-one onto function on the universe. (Contributed by NM, 16-May-2004.)

Assertion

Ref	Expression
f1ovi	⊢ I :V–1-1-onto→V

Proof of Theorem f1ovi

Step	Hyp	Ref	Expression
1		f1oi 6859	. 2 ⊢ ( I ↾ V):V–1-1-onto→V
2		reli 5813	. . . 4 ⊢ Rel I
3		dfrel3 6197	. . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I )
4	2, 3	mpbi 233	. . 3 ⊢ ( I ↾ V) = I
5		f1oeq1 6808	. . 3 ⊢ (( I ↾ V) = I → (( I ↾ V):V–1-1-onto→V ↔ I :V–1-1-onto→V))
6	4, 5	ax-mp 5	. 2 ⊢ (( I ↾ V):V–1-1-onto→V ↔ I :V–1-1-onto→V)
7	1, 6	mpbi 233	1 ⊢ I :V–1-1-onto→V

Syntax hints:   ↔ wb 209   = wceq 1568  Vcvv 3453   I cid 5555   ↾ cres 5663  Rel wrel 5666  –1-1-onto→wf1o 6535

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2143  ax-9 2151  ax-ext 2733  ax-sep 5256  ax-pr 5404

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-sb 2095  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3415  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4487  df-sn 4589  df-pr 4591  df-op 4595  df-br 5109  df-opab 5173  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543

This theorem is referenced by:  ncanth  7365  nregmodelf1o  45672