Theorem f1ovi 6849

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 6847	. 2 ⊢ ( I ↾ V):V–1-1-onto→V
2		reli 5801	. . . 4 ⊢ Rel I
3		dfrel3 6187	. . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I )
4	2, 3	mpbi 232	. . 3 ⊢ ( I ↾ V) = I
5		f1oeq1 6796	. . 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 232	1 ⊢ I :V–1-1-onto→V

Syntax hints:   ↔ wb 208   = wceq 1562  Vcvv 3456   I cid 5543   ↾ cres 5651  Rel wrel 5654  –1-1-onto→wf1o 6522

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-ext 2736  ax-sep 5248  ax-pr 5392

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-sb 2093  df-clab 2743  df-cleq 2756  df-clel 2839  df-ral 3079  df-rex 3089  df-rab 3417  df-v 3458  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5103  df-opab 5165  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-res 5661  df-ima 5662  df-fun 6525  df-fn 6526  df-f 6527  df-f1 6528  df-fo 6529  df-f1o 6530

This theorem is referenced by:  ncanth  7353  nregmodelf1o  45596