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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 4861 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4563 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4292 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4292 | . . 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 4248 | . 2 ⊢ (((𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) ∧ 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) → (𝐴 × 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 414 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 × 𝐵) ∈ V) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2203 Vcvv 2812 ∪ cun 3208 ⊆ wss 3210 𝒫 cpw 3668 × cxp 4746 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-pow 4286 ax-pr 4321 ax-un 4553 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-rex 2526 df-v 2814 df-un 3214 df-in 3216 df-ss 3223 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-opab 4171 df-xp 4754 |
| This theorem is referenced by: xpexd 4864 xpex 4865 sqxpexg 4867 resiexg 5082 cnvexg 5299 coexg 5306 fex2 5530 fabexg 5553 resfunexgALT 6300 cofunexg 6301 fnexALT 6303 funexw 6304 opabex3d 6313 opabex3 6314 oprabexd 6319 ofmresex 6329 mpoexxg 6405 tposexg 6488 erex 6790 pmex 6886 mapex 6887 pmvalg 6892 elpmg 6897 fvdiagfn 6927 ixpexgg 6956 ixpsnf1o 6970 map1 7053 xpdom2 7081 xpdom3m 7084 xpen 7097 mapxpen 7100 xpfi 7191 djuex 7333 djuassen 7523 cc2lem 7579 shftfvalg 11499 climconst2 11972 prdsval 13478 prdsbaslemss 13479 pwsval 13496 pwsbas 13497 mulgnngsum 13836 releqgg 13929 eqgex 13930 eqgfval 13931 dvdsrvald 14230 dvdsrex 14235 aprval 14420 aprap 14424 psrval 14806 psrbasg 14821 psrplusgg 14825 lmfval 15050 txbasex 15114 txopn 15122 txcn 15132 txrest 15133 blfvalps 15242 xmetxp 15364 limccnp2lem 15533 limccnp2cntop 15534 dvfvalap 15538 |
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