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| Mirrors > Home > ILE Home > Th. List > xpexg | GIF version | ||
| Description: The cross product of two sets is a set. Proposition 6.2 of [TakeutiZaring] p. 23. (Contributed by NM, 14-Aug-1994.) |
| Ref | Expression |
|---|---|
| xpexg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 × 𝐵) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xpsspw 4887 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4589 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4317 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4317 | . . 3 ⊢ (𝒫 (𝐴 ∪ 𝐵) ∈ V → 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 5 | 2, 3, 4 | 3syl 17 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) |
| 6 | ssexg 4272 | . 2 ⊢ (((𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) ∧ 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) → (𝐴 × 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 418 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 × 𝐵) ∈ V) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∈ wcel 2209 Vcvv 2821 ∪ cun 3218 ⊆ wss 3220 𝒫 cpw 3688 × cxp 4772 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-opab 4193 df-xp 4780 |
| This theorem is used by: xpexd 4890 xpex 4891 sqxpexg 4893 resiexg 5108 cnvexg 5325 coexg 5332 fex2 5556 fabexg 5579 resfunexgALT 6337 cofunexg 6338 fnexALT 6340 funexw 6341 opabex3d 6350 opabex3 6351 oprabexd 6360 ofmresex 6370 mpoexxg 6446 tposexg 6529 erex 6831 pmex 6927 mapex 6928 pmvalg 6933 elpmg 6938 fvdiagfn 6975 ixpexgg 7004 ixpsnf1o 7018 map1 7101 xpdom2 7129 xpdom3m 7132 xpen 7145 mapxpen 7148 xpfi 7239 djuex 7383 djuassen 7573 cc2lem 7632 shftfvalg 11585 climconst2 12059 mulgnngzsum 13932 releqgg 14025 eqgex 14026 eqgfval 14027 prdsval 14175 prdsbaslemss 14176 pwsval 14206 pwsbas 14207 dvdsrvald 14402 dvdsrex 14407 aprval 14593 aprap 14600 psrval 15052 psrbasg 15067 psrplusgg 15071 lmfval 15296 txbasex 15360 txopn 15368 txcn 15378 txrest 15379 blfvalps 15488 xmetxp 15610 limccnp2lem 15779 limccnp2cntop 15780 dvfvalap 15784 |
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