ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  nffun GIF version

Theorem nffun 5398
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 5377 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 4858 . . 3 𝑥Rel 𝐹
42nfcnv 4957 . . . . 5 𝑥𝐹
52, 4nfco 4943 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2392 . . . 4 𝑥 I
75, 6nfss 3241 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1618 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1527 1 𝑥Fun 𝐹
Colors of variables: wff set class
Syntax hints:  wa 104  wnf 1513  wnfc 2379  wss 3220   I cid 4431  ccnv 4771  ccom 4776  Rel wrel 4777  Fun wfun 5369
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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3714  df-pr 3715  df-op 3717  df-br 4129  df-opab 4191  df-rel 4779  df-cnv 4780  df-co 4781  df-fun 5377
This theorem is referenced by:  nffn  5475  nff1  5594  fliftfun  5996  funimass4f  6353
  Copyright terms: Public domain W3C validator