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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 4889 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4591 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4319 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4319 | . . 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 4274 | . 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 4774 |
| 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 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 |
| 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 4194 df-xp 4782 |
| This theorem is used by: xpexd 4892 xpex 4893 sqxpexg 4895 resiexg 5111 cnvexg 5328 coexg 5335 fex2 5559 fabexg 5582 resfunexgALT 6341 cofunexg 6342 fnexALT 6344 funexw 6345 opabex3d 6354 opabex3 6355 oprabexd 6364 ofmresex 6374 mpoexxg 6450 tposexg 6533 erex 6835 pmex 6931 mapex 6932 pmvalg 6937 elpmg 6942 fvdiagfn 6980 ixpexgg 7009 ixpsnf1o 7023 map1 7106 xpdom2 7134 xpdom3m 7137 xpen 7150 mapxpen 7153 xpfi 7244 djuex 7390 djuassen 7580 cc2lem 7639 shftfvalg 11606 climconst2 12083 mulgnngzsum 13990 releqgg 14083 eqgex 14084 eqgfval 14085 prdsval 14281 prdsbaslemss 14282 pwsval 14312 pwsbas 14313 dvdsrvald 14510 dvdsrex 14515 aprval 14701 aprap 14708 psrval 15162 psrbasg 15183 psrplusgg 15187 psrlidmfi 15204 lmfval 15431 txbasex 15495 txopn 15503 txcn 15513 txrest 15514 blfvalps 15623 xmetxp 15745 limccnp2lem 15914 limccnp2cntop 15915 dvfvalap 15919 |
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