| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 4869 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4571 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4299 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4299 | . . 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 4255 | . 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 2205 Vcvv 2815 ∪ cun 3212 ⊆ wss 3214 𝒫 cpw 3675 × cxp 4754 |
| 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-14 2208 ax-ext 2216 ax-sep 4234 ax-pow 4293 ax-pr 4328 ax-un 4560 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-rex 2528 df-v 2817 df-un 3218 df-in 3220 df-ss 3227 df-pw 3677 df-sn 3701 df-pr 3702 df-op 3704 df-uni 3921 df-opab 4178 df-xp 4762 |
| This theorem is referenced by: xpexd 4872 xpex 4873 sqxpexg 4875 resiexg 5090 cnvexg 5307 coexg 5314 fex2 5538 fabexg 5561 resfunexgALT 6312 cofunexg 6313 fnexALT 6315 funexw 6316 opabex3d 6325 opabex3 6326 oprabexd 6335 ofmresex 6345 mpoexxg 6421 tposexg 6504 erex 6806 pmex 6902 mapex 6903 pmvalg 6908 elpmg 6913 fvdiagfn 6943 ixpexgg 6972 ixpsnf1o 6986 map1 7069 xpdom2 7097 xpdom3m 7100 xpen 7113 mapxpen 7116 xpfi 7207 djuex 7349 djuassen 7539 cc2lem 7598 shftfvalg 11533 climconst2 12007 mulgnngsum 13886 releqgg 13979 eqgex 13980 eqgfval 13981 prdsval 14121 prdsbaslemss 14122 pwsval 14152 pwsbas 14153 dvdsrvald 14344 dvdsrex 14349 aprval 14535 aprap 14542 psrval 14946 psrbasg 14961 psrplusgg 14965 lmfval 15190 txbasex 15254 txopn 15262 txcn 15272 txrest 15273 blfvalps 15382 xmetxp 15504 limccnp2lem 15673 limccnp2cntop 15674 dvfvalap 15678 |
| Copyright terms: Public domain | W3C validator |