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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 6168 | . . . . 5 ⊢ dom (𝐴 × {𝐵}) ⊆ 𝐴 | |
| 2 | 1 | sseli 3930 | . . . 4 ⊢ (𝑋 ∈ dom (𝐴 × {𝐵}) → 𝑋 ∈ 𝐴) |
| 3 | fvconstdomi.1 | . . . . 5 ⊢ 𝐵 ∈ V | |
| 4 | 3 | fvconst2 7206 | . . . 4 ⊢ (𝑋 ∈ 𝐴 → ((𝐴 × {𝐵})‘𝑋) = 𝐵) |
| 5 | 2, 4 | syl 18 | . . 3 ⊢ (𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) = 𝐵) |
| 6 | domrefg 8996 | . . . 4 ⊢ (𝐵 ∈ V → 𝐵 ≼ 𝐵) | |
| 7 | 3, 6 | ax-mp 5 | . . 3 ⊢ 𝐵 ≼ 𝐵 |
| 8 | 5, 7 | eqbrtrdi 5148 | . 2 ⊢ (𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵) |
| 9 | ndmfv 6914 | . . 3 ⊢ (¬ 𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) = ∅) | |
| 10 | 3 | 0dom 9108 | . . 3 ⊢ ∅ ≼ 𝐵 |
| 11 | 9, 10 | eqbrtrdi 5148 | . 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 3453 ∅c0 4282 {csn 4587 class class class wbr 5107 × cxp 5657 dom cdm 5659 ‘cfv 6537 ≼ cdom 8953 |
| 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 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-en 8956 df-dom 8957 |
| This theorem is used by: f1omoALT 49808 |
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