Theorem f1ovi 6812

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 6810	. 2 ⊢ ( I ↾ V):V–1-1-onto→V
2		reli 5773	. . . 4 ⊢ Rel I
3		dfrel3 6154	. . . 4 ⊢ (Rel I ↔ ( I ↾ V) = I )
4	2, 3	mpbi 230	. . 3 ⊢ ( I ↾ V) = I
5		f1oeq1 6760	. . 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 230	1 ⊢ I :V–1-1-onto→V

Syntax hints:   ↔ wb 206   = wceq 1542  Vcvv 3430   I cid 5516   ↾ cres 5624  Rel wrel 5627  –1-1-onto→wf1o 6489

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-sep 5231  ax-pr 5368

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-br 5087  df-opab 5149  df-id 5517  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-ima 5635  df-fun 6492  df-fn 6493  df-f 6494  df-f1 6495  df-fo 6496  df-f1o 6497

This theorem is referenced by:  ncanth  7313  nregmodelf1o  45445