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| Mirrors > Home > MPE Home > Th. List > Mathboxes > ovsng | Structured version Visualization version GIF version | ||
| Description: The operation value of a singleton of a nested ordered pair is the last member. (Contributed by Zhi Wang, 22-Oct-2025.) |
| Ref | Expression |
|---|---|
| ovsng | ⊢ (𝐶 ∈ 𝑉 → (𝐴{〈〈𝐴, 𝐵〉, 𝐶〉}𝐵) = 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ov 7427 | . 2 ⊢ (𝐴{〈〈𝐴, 𝐵〉, 𝐶〉}𝐵) = ({〈〈𝐴, 𝐵〉, 𝐶〉}‘〈𝐴, 𝐵〉) | |
| 2 | opex 5432 | . . 3 ⊢ 〈𝐴, 𝐵〉 ∈ V | |
| 3 | fvsng 7189 | . . 3 ⊢ ((〈𝐴, 𝐵〉 ∈ V ∧ 𝐶 ∈ 𝑉) → ({〈〈𝐴, 𝐵〉, 𝐶〉}‘〈𝐴, 𝐵〉) = 𝐶) | |
| 4 | 2, 3 | mpan 703 | . 2 ⊢ (𝐶 ∈ 𝑉 → ({〈〈𝐴, 𝐵〉, 𝐶〉}‘〈𝐴, 𝐵〉) = 𝐶) |
| 5 | 1, 4 | eqtrid 2807 | 1 ⊢ (𝐶 ∈ 𝑉 → (𝐴{〈〈𝐴, 𝐵〉, 𝐶〉}𝐵) = 𝐶) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2144 Vcvv 3450 {csn 4584 〈cop 4834 ‘cfv 6543 (class class class)co 7424 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-pr 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-iota 6497 df-fun 6545 df-fv 6551 df-ov 7427 |
| This theorem is used by: ovsng2 50078 ovsn 50079 |
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