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

Theorem funressn 6308
Description: A function restricted to a singleton. (Contributed by Mario Carneiro, 16-Nov-2014.)
Assertion
Ref Expression
funressn (Fun 𝐹 → (𝐹 ↾ {𝐵}) ⊆ {⟨𝐵, (𝐹𝐵)⟩})

Proof of Theorem funressn
StepHypRef Expression
1 funfn 5818 . . . 4 (Fun 𝐹𝐹 Fn dom 𝐹)
2 fnressn 6307 . . . 4 ((𝐹 Fn dom 𝐹𝐵 ∈ dom 𝐹) → (𝐹 ↾ {𝐵}) = {⟨𝐵, (𝐹𝐵)⟩})
31, 2sylanb 487 . . 3 ((Fun 𝐹𝐵 ∈ dom 𝐹) → (𝐹 ↾ {𝐵}) = {⟨𝐵, (𝐹𝐵)⟩})
4 eqimss 3619 . . 3 ((𝐹 ↾ {𝐵}) = {⟨𝐵, (𝐹𝐵)⟩} → (𝐹 ↾ {𝐵}) ⊆ {⟨𝐵, (𝐹𝐵)⟩})
53, 4syl 17 . 2 ((Fun 𝐹𝐵 ∈ dom 𝐹) → (𝐹 ↾ {𝐵}) ⊆ {⟨𝐵, (𝐹𝐵)⟩})
6 disjsn 4191 . . . . 5 ((dom 𝐹 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ dom 𝐹)
7 fnresdisj 5900 . . . . . 6 (𝐹 Fn dom 𝐹 → ((dom 𝐹 ∩ {𝐵}) = ∅ ↔ (𝐹 ↾ {𝐵}) = ∅))
81, 7sylbi 205 . . . . 5 (Fun 𝐹 → ((dom 𝐹 ∩ {𝐵}) = ∅ ↔ (𝐹 ↾ {𝐵}) = ∅))
96, 8syl5bbr 272 . . . 4 (Fun 𝐹 → (¬ 𝐵 ∈ dom 𝐹 ↔ (𝐹 ↾ {𝐵}) = ∅))
109biimpa 499 . . 3 ((Fun 𝐹 ∧ ¬ 𝐵 ∈ dom 𝐹) → (𝐹 ↾ {𝐵}) = ∅)
11 0ss 3923 . . 3 ∅ ⊆ {⟨𝐵, (𝐹𝐵)⟩}
1210, 11syl6eqss 3617 . 2 ((Fun 𝐹 ∧ ¬ 𝐵 ∈ dom 𝐹) → (𝐹 ↾ {𝐵}) ⊆ {⟨𝐵, (𝐹𝐵)⟩})
135, 12pm2.61dan 827 1 (Fun 𝐹 → (𝐹 ↾ {𝐵}) ⊆ {⟨𝐵, (𝐹𝐵)⟩})
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 194  wa 382   = wceq 1474  wcel 1976  cin 3538  wss 3539  c0 3873  {csn 4124  cop 4130  dom cdm 5027  cres 5029  Fun wfun 5783   Fn wfn 5784  cfv 5789
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-9 1985  ax-10 2005  ax-11 2020  ax-12 2033  ax-13 2233  ax-ext 2589  ax-sep 4703  ax-nul 4711  ax-pr 4827
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1867  df-eu 2461  df-mo 2462  df-clab 2596  df-cleq 2602  df-clel 2605  df-nfc 2739  df-ne 2781  df-ral 2900  df-rex 2901  df-reu 2902  df-rab 2904  df-v 3174  df-sbc 3402  df-dif 3542  df-un 3544  df-in 3546  df-ss 3553  df-nul 3874  df-if 4036  df-sn 4125  df-pr 4127  df-op 4131  df-uni 4367  df-br 4578  df-opab 4638  df-id 4942  df-xp 5033  df-rel 5034  df-cnv 5035  df-co 5036  df-dm 5037  df-rn 5038  df-res 5039  df-ima 5040  df-iota 5753  df-fun 5791  df-fn 5792  df-f 5793  df-f1 5794  df-fo 5795  df-f1o 5796  df-fv 5797
This theorem is referenced by:  fnsnb  6314  tfrlem16  7353  fnfi  8100  fodomfi  8101  bnj142OLD  29841
  Copyright terms: Public domain W3C validator