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| Mirrors > Home > ILE Home > Th. List > fv2prc | 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 5577 | . . 3 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) | |
| 2 | 1 | fveq1d 5585 | . 2 ⊢ (¬ 𝐴 ∈ V → ((𝐹‘𝐴)‘𝐵) = (∅‘𝐵)) |
| 3 | 0fv 5619 | . 2 ⊢ (∅‘𝐵) = ∅ | |
| 4 | 2, 3 | eqtrdi 2255 | 1 ⊢ (¬ 𝐴 ∈ V → ((𝐹‘𝐴)‘𝐵) = ∅) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1373 ∈ wcel 2177 Vcvv 2773 ∅c0 3461 ‘cfv 5276 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-pow 4222 ax-setind 4589 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-ral 2490 df-rex 2491 df-v 2775 df-dif 3169 df-un 3171 df-in 3173 df-ss 3180 df-nul 3462 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-uni 3853 df-br 4048 df-iota 5237 df-fv 5284 |
| This theorem is referenced by: (None) |
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