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| Description: If the restriction of a class to a singleton is not a function, its operation value is the universal class. (Contributed by Alexander van der Vekens, 26-May-2017.) | 
| Ref | Expression | 
|---|---|
| nfunsnaov | ⊢ (¬ Fun (𝐹 ↾ {〈𝐴, 𝐵〉}) → ((𝐴𝐹𝐵)) = V) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | df-aov 47133 | . 2 ⊢ ((𝐴𝐹𝐵)) = (𝐹'''〈𝐴, 𝐵〉) | |
| 2 | nfunsnafv 47154 | . 2 ⊢ (¬ Fun (𝐹 ↾ {〈𝐴, 𝐵〉}) → (𝐹'''〈𝐴, 𝐵〉) = V) | |
| 3 | 1, 2 | eqtrid 2789 | 1 ⊢ (¬ Fun (𝐹 ↾ {〈𝐴, 𝐵〉}) → ((𝐴𝐹𝐵)) = V) | 
| Colors of variables: wff setvar class | 
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1540 Vcvv 3480 {csn 4626 〈cop 4632 ↾ cres 5687 Fun wfun 6555 '''cafv 47129 ((caov 47130 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pr 5432 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-nul 4334 df-if 4526 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-br 5144 df-opab 5206 df-id 5578 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-res 5697 df-iota 6514 df-fun 6563 df-fv 6569 df-aiota 47097 df-dfat 47131 df-afv 47132 df-aov 47133 | 
| This theorem is referenced by: (None) | 
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