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Theorem rnressnsn 32750
Description: The range of a restriction to a singleton is a singleton. See dmressnsn 5988. (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 6528 . . . 4 (Fun 𝐹𝐹 Fn dom 𝐹)
2 fnressn 7112 . . . 4 ((𝐹 Fn dom 𝐹𝐴 ∈ dom 𝐹) → (𝐹 ↾ {𝐴}) = {⟨𝐴, (𝐹𝐴)⟩})
31, 2sylanb 582 . . 3 ((Fun 𝐹𝐴 ∈ dom 𝐹) → (𝐹 ↾ {𝐴}) = {⟨𝐴, (𝐹𝐴)⟩})
43rneqd 5893 . 2 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran (𝐹 ↾ {𝐴}) = ran {⟨𝐴, (𝐹𝐴)⟩})
5 rnsnopg 6185 . . 3 (𝐴 ∈ dom 𝐹 → ran {⟨𝐴, (𝐹𝐴)⟩} = {(𝐹𝐴)})
65adantl 481 . 2 ((Fun 𝐹𝐴 ∈ dom 𝐹) → ran {⟨𝐴, (𝐹𝐴)⟩} = {(𝐹𝐴)})
74, 6eqtrd 2771 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 4567  cop 4573  dom cdm 5631  ran crn 5632  cres 5633  Fun wfun 6492   Fn wfn 6493  cfv 6498
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 2708  ax-sep 5231  ax-nul 5241  ax-pr 5375
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 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-ne 2933  df-ral 3052  df-rex 3062  df-reu 3343  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506
This theorem is referenced by:  esplyind  33719
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