Theorem nff1o 6048

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

Hypotheses

Ref	Expression
nff1o.1	⊢ Ⅎ𝑥𝐹
nff1o.2	⊢ Ⅎ𝑥𝐴
nff1o.3	⊢ Ⅎ𝑥𝐵

Assertion

Ref	Expression
nff1o	⊢ Ⅎ𝑥 𝐹:𝐴–1-1-onto→𝐵

Proof of Theorem nff1o

Step	Hyp	Ref	Expression
1		df-f1o 5811	. 2 ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹:𝐴–1-1→𝐵 ∧ 𝐹:𝐴–onto→𝐵))
2		nff1o.1	. . . 4 ⊢ Ⅎ𝑥𝐹
3		nff1o.2	. . . 4 ⊢ Ⅎ𝑥𝐴
4		nff1o.3	. . . 4 ⊢ Ⅎ𝑥𝐵
5	2, 3, 4	nff1 6012	. . 3 ⊢ Ⅎ𝑥 𝐹:𝐴–1-1→𝐵
6	2, 3, 4	nffo 6027	. . 3 ⊢ Ⅎ𝑥 𝐹:𝐴–onto→𝐵
7	5, 6	nfan 1816	. 2 ⊢ Ⅎ𝑥(𝐹:𝐴–1-1→𝐵 ∧ 𝐹:𝐴–onto→𝐵)
8	1, 7	nfxfr 1771	1 ⊢ Ⅎ𝑥 𝐹:𝐴–1-1-onto→𝐵

Syntax hints:   ∧ wa 383  Ⅎwnf 1699  Ⅎwnfc 2738  –1-1→wf1 5801  –onto→wfo 5802  –1-1-onto→wf1o 5803

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811

This theorem is referenced by:  nfiso  6472  nfsum1  14268  nfsum  14269  nfcprod1  14479  nfcprod  14480  esumiun  29483  wessf1ornlem  38366  stoweidlem35  38928