Theorem nff1 6573

Description: Bound-variable hypothesis builder for a one-to-one function. (Contributed by NM, 16-May-2004.)

Hypotheses

Ref	Expression
nff1.1	⊢ Ⅎ𝑥𝐹
nff1.2	⊢ Ⅎ𝑥𝐴
nff1.3	⊢ Ⅎ𝑥𝐵

Assertion

Ref	Expression
nff1	⊢ Ⅎ𝑥 𝐹:𝐴–1-1→𝐵

Proof of Theorem nff1

Step	Hyp	Ref	Expression
1		df-f1 6360	. 2 ⊢ (𝐹:𝐴–1-1→𝐵 ↔ (𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹))
2		nff1.1	. . . 4 ⊢ Ⅎ𝑥𝐹
3		nff1.2	. . . 4 ⊢ Ⅎ𝑥𝐴
4		nff1.3	. . . 4 ⊢ Ⅎ𝑥𝐵
5	2, 3, 4	nff 6510	. . 3 ⊢ Ⅎ𝑥 𝐹:𝐴⟶𝐵
6	2	nfcnv 5749	. . . 4 ⊢ Ⅎ𝑥◡𝐹
7	6	nffun 6378	. . 3 ⊢ Ⅎ𝑥Fun ◡𝐹
8	5, 7	nfan 1900	. 2 ⊢ Ⅎ𝑥(𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹)
9	1, 8	nfxfr 1853	1 ⊢ Ⅎ𝑥 𝐹:𝐴–1-1→𝐵

Syntax hints:   ∧ wa 398  Ⅎwnf 1784  Ⅎwnfc 2961  ^◡ccnv 5554  Fun wfun 6349  ⟶wf 6351  –1-1→wf1 6352

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rab 3147  df-v 3496  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-br 5067  df-opab 5129  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360

This theorem is referenced by:  nff1o  6613  iundom2g  9962