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| Mirrors > Home > MPE Home > Th. List > Mathboxes > fvconstdomi | Structured version Visualization version GIF version | ||
| Description: A constant function's value is dominated by the constant. (An artifact of our function value definition.) (Contributed by Zhi Wang, 18-Sep-2024.) |
| Ref | Expression |
|---|---|
| fvconstdomi.1 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| fvconstdomi | ⊢ ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dmxpss 6164 | . . . . 5 ⊢ dom (𝐴 × {𝐵}) ⊆ 𝐴 | |
| 2 | 1 | sseli 3927 | . . . 4 ⊢ (𝑋 ∈ dom (𝐴 × {𝐵}) → 𝑋 ∈ 𝐴) |
| 3 | fvconstdomi.1 | . . . . 5 ⊢ 𝐵 ∈ V | |
| 4 | 3 | fvconst2 7203 | . . . 4 ⊢ (𝑋 ∈ 𝐴 → ((𝐴 × {𝐵})‘𝑋) = 𝐵) |
| 5 | 2, 4 | syl 18 | . . 3 ⊢ (𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) = 𝐵) |
| 6 | domrefg 8993 | . . . 4 ⊢ (𝐵 ∈ V → 𝐵 ≼ 𝐵) | |
| 7 | 3, 6 | ax-mp 5 | . . 3 ⊢ 𝐵 ≼ 𝐵 |
| 8 | 5, 7 | eqbrtrdi 5144 | . 2 ⊢ (𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵) |
| 9 | ndmfv 6910 | . . 3 ⊢ (¬ 𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) = ∅) | |
| 10 | 3 | 0dom 9105 | . . 3 ⊢ ∅ ≼ 𝐵 |
| 11 | 9, 10 | eqbrtrdi 5144 | . 2 ⊢ (¬ 𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵) |
| 12 | 8, 11 | pm2.61i 184 | 1 ⊢ ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 = wceq 1570 ∈ wcel 2145 Vcvv 3450 ∅c0 4279 {csn 4584 class class class wbr 5103 × cxp 5653 dom cdm 5655 ‘cfv 6533 ≼ cdom 8950 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-en 8953 df-dom 8954 |
| This theorem is used by: f1omoALT 49821 |
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