MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  nffun Structured version   Visualization version   GIF version

Theorem nffun 6590
Description: Bound-variable hypothesis builder for a function. (Contributed by NM, 30-Jan-2004.)
Hypothesis
Ref Expression
nffun.1 Ⅎ𝑥𝐹
Assertion
Ref Expression
nffun Ⅎ𝑥Fun 𝐹

Proof of Theorem nffun
StepHypRef Expression
1 df-fun 6568 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹 ∘ ◡𝐹) ⊆ I ))
2 nffun.1 . . . 4 Ⅎ𝑥𝐹
32nfrel 5764 . . 3 Ⅎ𝑥Rel 𝐹
42nfcnv 5868 . . . . 5 Ⅎ𝑥◡𝐹
52, 4nfco 5854 . . . 4 Ⅎ𝑥(𝐹 ∘ ◡𝐹)
6 nfcv 2926 . . . 4 Ⅎ𝑥 I
75, 6nfss 3906 . . 3 Ⅎ𝑥(𝐹 ∘ ◡𝐹) ⊆ I
83, 7nfan 1934 . 2 Ⅎ𝑥(Rel 𝐹 ∧ (𝐹 ∘ ◡𝐹) ⊆ I )
91, 8nfxfr 1886 1 Ⅎ𝑥Fun 𝐹
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∧ wa 401  Ⅎwnf 1816  Ⅎwnfc 2911   ⊆ wss 3900   I cid 5552  ◡ccnv 5657   ∘ ccom 5662  Rel wrel 5663  Fun wfun 6560
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735
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 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-br 5109  df-opab 5174  df-rel 5665  df-cnv 5666  df-co 5667  df-fun 6568
This theorem is used by:  nffn  6668  nff1  6806  fliftfun  7351  funimass4f  33329  srepdflem1  36126  nfdfat  48470
  Copyright terms: Public domain W3C validator