Theorem f1ovi 6811

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 6809	. 2 ⊢ ( I ↾ V):V–1-1-onto→V
2		reli 5772	. . . 4 ⊢ Rel I
3		dfrel3 6153	. . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I )
4	2, 3	mpbi 232	. . 3 ⊢ ( I ↾ V) = I
5		f1oeq1 6759	. . 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 1548  Vcvv 3433   I cid 5515   ↾ cres 5623  Rel wrel 5626  –1-1-onto→wf1o 6488

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1975  ax-7 2016  ax-8 2123  ax-9 2131  ax-ext 2713  ax-sep 5221  ax-pr 5365

This theorem depends on definitions:  df-bi 209  df-an 398  df-or 855  df-3an 1095  df-tru 1551  df-fal 1561  df-ex 1788  df-sb 2075  df-clab 2720  df-cleq 2733  df-clel 2816  df-ral 3056  df-rex 3066  df-rab 3394  df-v 3435  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-nul 4265  df-if 4458  df-sn 4559  df-pr 4561  df-op 4565  df-br 5076  df-opab 5138  df-id 5516  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-rn 5632  df-res 5633  df-ima 5634  df-fun 6491  df-fn 6492  df-f 6493  df-f1 6494  df-fo 6495  df-f1o 6496

This theorem is referenced by:  ncanth  7315  nregmodelf1o  45474