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Theorem nff1 6781
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
StepHypRef Expression
1 df-f1 6548 . 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
52, 3, 4nff 6710 . . 3 Ⅎ𝑥 𝐹:𝐴⟶𝐵
62nfcnv 5857 . . . 4 Ⅎ𝑥◡𝐹
76nffun 6567 . . 3 Ⅎ𝑥Fun ◡𝐹
85, 7nfan 1931 . 2 Ⅎ𝑥(𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹)
91, 8nfxfr 1885 1 Ⅎ𝑥 𝐹:𝐴–1-1→𝐵
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∧ wa 401  Ⅎwnf 1815  Ⅎwnfc 2907  ◡ccnv 5650  Fun wfun 6537  ⟶wf 6539  –1-1→wf1 6540
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ral 3077  df-rab 3413  df-v 3452  df-ss 3897  df-dif 4046  df-un 4150  df-nul 4278  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-br 5103  df-opab 5167  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548
This theorem is used by:  nff1o  6827  iundom2g  10631  onprcf1of1ord  36006
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