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| Mirrors > Home > ILE Home > Th. List > dfmptg | GIF version | ||
| Description: Alternate definition for the maps-to notation df-mpt 4150 (which requires that 𝐵 be a set). (Contributed by Jim Kingdon, 9-Jan-2019.) |
| Ref | Expression |
|---|---|
| dfmptg | ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝑉 → (𝑥 ∈ 𝐴 ↦ 𝐵) = ∪ 𝑥 ∈ 𝐴 {〈𝑥, 𝐵〉}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfmpt3 5452 | . 2 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = ∪ 𝑥 ∈ 𝐴 ({𝑥} × {𝐵}) | |
| 2 | vex 2803 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 3 | xpsng 5818 | . . . . 5 ⊢ ((𝑥 ∈ V ∧ 𝐵 ∈ 𝑉) → ({𝑥} × {𝐵}) = {〈𝑥, 𝐵〉}) | |
| 4 | 2, 3 | mpan 424 | . . . 4 ⊢ (𝐵 ∈ 𝑉 → ({𝑥} × {𝐵}) = {〈𝑥, 𝐵〉}) |
| 5 | 4 | ralimi 2593 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝑉 → ∀𝑥 ∈ 𝐴 ({𝑥} × {𝐵}) = {〈𝑥, 𝐵〉}) |
| 6 | iuneq2 3984 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 ({𝑥} × {𝐵}) = {〈𝑥, 𝐵〉} → ∪ 𝑥 ∈ 𝐴 ({𝑥} × {𝐵}) = ∪ 𝑥 ∈ 𝐴 {〈𝑥, 𝐵〉}) | |
| 7 | 5, 6 | syl 14 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝑉 → ∪ 𝑥 ∈ 𝐴 ({𝑥} × {𝐵}) = ∪ 𝑥 ∈ 𝐴 {〈𝑥, 𝐵〉}) |
| 8 | 1, 7 | eqtrid 2274 | 1 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝑉 → (𝑥 ∈ 𝐴 ↦ 𝐵) = ∪ 𝑥 ∈ 𝐴 {〈𝑥, 𝐵〉}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ∈ wcel 2200 ∀wral 2508 Vcvv 2800 {csn 3667 〈cop 3670 ∪ ciun 3968 ↦ cmpt 4148 × cxp 4721 |
| 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-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-reu 2515 df-v 2802 df-sbc 3030 df-csb 3126 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-iun 3970 df-br 4087 df-opab 4149 df-mpt 4150 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 |
| This theorem is referenced by: fnasrng 5823 funiun 5824 |
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