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Theorem rnressnsn 32765
Description: The range of a restriction to a singleton is a singleton. See dmressnsn 5982. (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 6522 . . . 4 (Fun 𝐹𝐹 Fn dom 𝐹)
2 fnressn 7105 . . . 4 ((𝐹 Fn dom 𝐹𝐴 ∈ dom 𝐹) → (𝐹 ↾ {𝐴}) = {⟨𝐴, (𝐹𝐴)⟩})
31, 2sylanb 582 . . 3 ((Fun 𝐹𝐴 ∈ dom 𝐹) → (𝐹 ↾ {𝐴}) = {⟨𝐴, (𝐹𝐴)⟩})
43rneqd 5887 . 2 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran (𝐹 ↾ {𝐴}) = ran {⟨𝐴, (𝐹𝐴)⟩})
5 rnsnopg 6179 . . 3 (𝐴 ∈ dom 𝐹 → ran {⟨𝐴, (𝐹𝐴)⟩} = {(𝐹𝐴)})
65adantl 481 . 2 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran {⟨𝐴, (𝐹𝐴)⟩} = {(𝐹𝐴)})
74, 6eqtrd 2772 1 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran (𝐹 ↾ {𝐴}) = {(𝐹𝐴)})
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1542  wcel 2114  {csn 4568  cop 4574  dom cdm 5624  ran crn 5625  cres 5626  Fun wfun 6486   Fn wfn 6487  cfv 6492
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-12 2185  ax-ext 2709  ax-sep 5231  ax-nul 5241  ax-pr 5370
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-ne 2934  df-ral 3053  df-rex 3063  df-reu 3344  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-f1 6497  df-fo 6498  df-f1o 6499  df-fv 6500
This theorem is referenced by:  esplyind  33734
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