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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 2788 | 1 ⊢ (¬ 𝐴 ∈ V → ((𝐹‘𝐴)‘𝐵) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1542 ∈ wcel 2114 Vcvv 3430 ∅c0 4274 ‘cfv 6492 |
| 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-ext 2709 ax-nul 5241 ax-pr 5370 |
| 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-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-dm 5634 df-iota 6448 df-fv 6500 |
| This theorem is referenced by: elfv2ex 6877 itunitc1 10333 indval0 12154 sralem 21163 srasca 21167 sravsca 21168 sraip 21169 |
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