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Theorem nff1 6776
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 6543 . 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 6705 . . 3 Ⅎ𝑥 𝐹:𝐴⟶𝐵
62nfcnv 5856 . . . 4 Ⅎ𝑥◡𝐹
76nffun 6562 . . 3 Ⅎ𝑥Fun ◡𝐹
85, 7nfan 1932 . 2 Ⅎ𝑥(𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹)
91, 8nfxfr 1886 1 Ⅎ𝑥 𝐹:𝐴–1-1→𝐵
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∧ wa 401  Ⅎwnf 1816  Ⅎwnfc 2908  ◡ccnv 5650  Fun wfun 6532  ⟶wf 6534  –1-1→wf1 6535
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3078  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543
This theorem is used by:  nff1o  6822  iundom2g  10624
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