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| Mirrors > Home > MPE Home > Th. List > fv2prc | Structured version Visualization version GIF version | ||
| Description: A function value of a function value at a proper class is the empty set. (Contributed by AV, 8-Apr-2021.) |
| Ref | Expression |
|---|---|
| fv2prc | ⊢ (¬ 𝐴 ∈ V → ((𝐹‘𝐴)‘𝐵) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fvprc 6826 | . . 3 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) | |
| 2 | 1 | fveq1d 6836 | . 2 ⊢ (¬ 𝐴 ∈ V → ((𝐹‘𝐴)‘𝐵) = (∅‘𝐵)) |
| 3 | 0fv 6875 | . 2 ⊢ (∅‘𝐵) = ∅ | |
| 4 | 2, 3 | eqtrdi 2791 | 1 ⊢ (¬ 𝐴 ∈ V → ((𝐹‘𝐴)‘𝐵) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1547 ∈ wcel 2119 Vcvv 3432 ∅c0 4268 ‘cfv 6492 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2712 ax-nul 5235 ax-pr 5369 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-ne 2936 df-rab 3393 df-v 3434 df-dif 3893 df-un 3895 df-ss 3907 df-nul 4269 df-if 4462 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-br 5080 df-dm 5635 df-iota 6448 df-fv 6500 |
| This theorem is referenced by: elfv2ex 6877 itunitc1 10340 indval0 12161 sralem 21173 srasca 21177 sravsca 21178 sraip 21179 |
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