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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 4885 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4587 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4315 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4315 | . . 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 4270 | . 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 |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2209 Vcvv 2821 ∪ cun 3218 ⊆ wss 3220 𝒫 cpw 3688 × cxp 4770 |
| 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 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 4247 ax-pow 4309 ax-pr 4344 ax-un 4576 |
| This theorem 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 3714 df-pr 3715 df-op 3717 df-uni 3934 df-opab 4191 df-xp 4778 |
| This theorem is referenced by: xpexd 4888 xpex 4889 sqxpexg 4891 resiexg 5106 cnvexg 5323 coexg 5330 fex2 5554 fabexg 5577 resfunexgALT 6331 cofunexg 6332 fnexALT 6334 funexw 6335 opabex3d 6344 opabex3 6345 oprabexd 6354 ofmresex 6364 mpoexxg 6440 tposexg 6523 erex 6825 pmex 6921 mapex 6922 pmvalg 6927 elpmg 6932 fvdiagfn 6969 ixpexgg 6998 ixpsnf1o 7012 map1 7095 xpdom2 7123 xpdom3m 7126 xpen 7139 mapxpen 7142 xpfi 7233 djuex 7377 djuassen 7567 cc2lem 7626 shftfvalg 11566 climconst2 12040 mulgnngzsum 13913 releqgg 14006 eqgex 14007 eqgfval 14008 prdsval 14156 prdsbaslemss 14157 pwsval 14187 pwsbas 14188 dvdsrvald 14383 dvdsrex 14388 aprval 14574 aprap 14581 psrval 15033 psrbasg 15048 psrplusgg 15052 lmfval 15277 txbasex 15341 txopn 15349 txcn 15359 txrest 15360 blfvalps 15469 xmetxp 15591 limccnp2lem 15760 limccnp2cntop 15761 dvfvalap 15765 |
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