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Mirrors > Home > ILE Home > Th. List > omexg | GIF version |
Description: Ordinal multiplication is a set. (Contributed by Mario Carneiro, 3-Jul-2019.) |
Ref | Expression |
---|---|
omexg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ·o 𝐵) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 2733 | . . . 4 ⊢ 𝑦 ∈ V | |
2 | 0ex 4114 | . . . . 5 ⊢ ∅ ∈ V | |
3 | vex 2733 | . . . . . 6 ⊢ 𝑥 ∈ V | |
4 | omfnex 6425 | . . . . . 6 ⊢ (𝑥 ∈ V → (𝑧 ∈ V ↦ (𝑧 +o 𝑥)) Fn V) | |
5 | 3, 4 | ax-mp 5 | . . . . 5 ⊢ (𝑧 ∈ V ↦ (𝑧 +o 𝑥)) Fn V |
6 | 2, 5 | rdgexg 6365 | . . . 4 ⊢ (𝑦 ∈ V → (rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦) ∈ V) |
7 | 1, 6 | ax-mp 5 | . . 3 ⊢ (rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦) ∈ V |
8 | 7 | gen2 1443 | . 2 ⊢ ∀𝑥∀𝑦(rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦) ∈ V |
9 | df-omul 6397 | . . 3 ⊢ ·o = (𝑥 ∈ On, 𝑦 ∈ On ↦ (rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦)) | |
10 | 9 | mpofvex 6179 | . 2 ⊢ ((∀𝑥∀𝑦(rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦) ∈ V ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ·o 𝐵) ∈ V) |
11 | 8, 10 | mp3an1 1319 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ·o 𝐵) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∀wal 1346 ∈ wcel 2141 Vcvv 2730 ∅c0 3414 ↦ cmpt 4048 Oncon0 4346 Fn wfn 5191 ‘cfv 5196 (class class class)co 5850 reccrdg 6345 +o coa 6389 ·o comu 6390 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-coll 4102 ax-sep 4105 ax-nul 4113 ax-pow 4158 ax-pr 4192 ax-un 4416 ax-setind 4519 |
This theorem depends on definitions: df-bi 116 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-csb 3050 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-nul 3415 df-pw 3566 df-sn 3587 df-pr 3588 df-op 3590 df-uni 3795 df-iun 3873 df-br 3988 df-opab 4049 df-mpt 4050 df-tr 4086 df-id 4276 df-iord 4349 df-on 4351 df-suc 4354 df-xp 4615 df-rel 4616 df-cnv 4617 df-co 4618 df-dm 4619 df-rn 4620 df-res 4621 df-ima 4622 df-iota 5158 df-fun 5198 df-fn 5199 df-f 5200 df-f1 5201 df-fo 5202 df-f1o 5203 df-fv 5204 df-ov 5853 df-oprab 5854 df-mpo 5855 df-1st 6116 df-2nd 6117 df-recs 6281 df-irdg 6346 df-oadd 6396 df-omul 6397 |
This theorem is referenced by: fnoei 6428 oeiexg 6429 oeiv 6432 omv2 6441 |
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