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Theorem rnressnsn 33059
Description: The range of a restriction to a singleton is a singleton. See dmressnsn 6027. (Contributed by Thierry Arnoux, 25-Jan-2026.)
Assertion
Ref Expression
rnressnsn ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran (𝐹 ↾ {𝐴}) = {(𝐹𝐴)})

Proof of Theorem rnressnsn
StepHypRef Expression
1 funfn 6573 . . . 4 (Fun 𝐹𝐹 Fn dom 𝐹)
2 fnressn 7162 . . . 4 ((𝐹 Fn dom 𝐹𝐴 ∈ dom 𝐹) → (𝐹 ↾ {𝐴}) = {⟨𝐴, (𝐹𝐴)⟩})
31, 2sylanb 593 . . 3 ((Fun 𝐹𝐴 ∈ dom 𝐹) → (𝐹 ↾ {𝐴}) = {⟨𝐴, (𝐹𝐴)⟩})
43rneqd 5933 . 2 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran (𝐹 ↾ {𝐴}) = ran {⟨𝐴, (𝐹𝐴)⟩})
5 rnsnopg 6227 . . 3 (𝐴 ∈ dom 𝐹 → ran {⟨𝐴, (𝐹𝐴)⟩} = {(𝐹𝐴)})
65adantl 487 . 2 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran {⟨𝐴, (𝐹𝐴)⟩} = {(𝐹𝐴)})
74, 6eqtrd 2801 1 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran (𝐹 ↾ {𝐴}) = {(𝐹𝐴)})
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2146  {csn 4594  cop 4600  dom cdm 5666  ran crn 5667  cres 5668  Fun wfun 6537   Fn wfn 6538  cfv 6543
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 2148  ax-9 2156  ax-10 2179  ax-12 2216  ax-ext 2738  ax-sep 5262  ax-nul 5274  ax-pr 5409
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-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-ne 2962  df-ral 3083  df-rex 3093  df-reu 3373  df-rab 3420  df-v 3460  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-br 5115  df-opab 5179  df-id 5561  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-iota 6499  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551
This theorem is used by:  esplyind  33996
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