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Theorem ovsng 49937
Description: The operation value of a singleton of a nested ordered pair is the last member. (Contributed by Zhi Wang, 22-Oct-2025.)
Assertion
Ref Expression
ovsng (𝐶 ∈ 𝑉 → (𝐴{⟨⟨𝐴, 𝐵⟩, 𝐶⟩}𝐵) = 𝐶)

Proof of Theorem ovsng
StepHypRef Expression
1 df-ov 7421 . 2 (𝐴{⟨⟨𝐴, 𝐵⟩, 𝐶⟩}𝐵) = ({⟨⟨𝐴, 𝐵⟩, 𝐶⟩}‘⟨𝐴, 𝐵⟩)
2 opex 5432 . . 3 ⟨𝐴, 𝐵⟩ ∈ V
3 fvsng 7183 . . 3 ((⟨𝐴, 𝐵⟩ ∈ V ∧ 𝐶 ∈ 𝑉) → ({⟨⟨𝐴, 𝐵⟩, 𝐶⟩}‘⟨𝐴, 𝐵⟩) = 𝐶)
42, 3mpan 703 . 2 (𝐶 ∈ 𝑉 → ({⟨⟨𝐴, 𝐵⟩, 𝐶⟩}‘⟨𝐴, 𝐵⟩) = 𝐶)
51, 4eqtrid 2808 1 (𝐶 ∈ 𝑉 → (𝐴{⟨⟨𝐴, 𝐵⟩, 𝐶⟩}𝐵) = 𝐶)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2145  Vcvv 3451  {csn 4584  ⟨cop 4590  ‘cfv 6537  (class class class)co 7418
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 2147  ax-9 2155  ax-10 2178  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-pr 5391
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 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-iota 6493  df-fun 6539  df-fv 6545  df-ov 7421
This theorem is used by:  ovsng2  49938  ovsn  49939
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