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Theorem nffun 5349
Description: Bound-variable hypothesis builder for a function. (Contributed by NM, 30-Jan-2004.)
Hypothesis
Ref Expression
nffun.1 𝑥𝐹
Assertion
Ref Expression
nffun 𝑥Fun 𝐹

Proof of Theorem nffun
StepHypRef Expression
1 df-fun 5328 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 4811 . . 3 𝑥Rel 𝐹
42nfcnv 4909 . . . . 5 𝑥𝐹
52, 4nfco 4895 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2374 . . . 4 𝑥 I
75, 6nfss 3220 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1613 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1522 1 𝑥Fun 𝐹
Colors of variables: wff set class
Syntax hints:  wa 104  wnf 1508  wnfc 2361  wss 3200   I cid 4385  ccnv 4724  ccom 4729  Rel wrel 4730  Fun wfun 5320
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-sn 3675  df-pr 3676  df-op 3678  df-br 4089  df-opab 4151  df-rel 4732  df-cnv 4733  df-co 4734  df-fun 5328
This theorem is referenced by:  nffn  5426  nff1  5540  fliftfun  5937
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