| 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 4838 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4540 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4270 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4270 | . . 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 4228 | . 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 2202 Vcvv 2802 ∪ cun 3198 ⊆ wss 3200 𝒫 cpw 3652 × cxp 4723 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-rex 2516 df-v 2804 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-opab 4151 df-xp 4731 |
| This theorem is referenced by: xpexd 4841 xpex 4842 sqxpexg 4843 resiexg 5058 cnvexg 5274 coexg 5281 fex2 5503 fabexg 5524 resfunexgALT 6270 cofunexg 6271 fnexALT 6273 funexw 6274 opabex3d 6283 opabex3 6284 oprabexd 6289 ofmresex 6299 mpoexxg 6375 tposexg 6424 erex 6726 pmex 6822 mapex 6823 pmvalg 6828 elpmg 6833 fvdiagfn 6862 ixpexgg 6891 ixpsnf1o 6905 map1 6987 xpdom2 7015 xpdom3m 7018 xpen 7031 mapxpen 7034 xpfi 7124 djuex 7242 djuassen 7432 cc2lem 7485 shftfvalg 11383 climconst2 11856 prdsval 13361 prdsbaslemss 13362 pwsval 13379 pwsbas 13380 mulgnngsum 13719 releqgg 13812 eqgex 13813 eqgfval 13814 dvdsrvald 14113 dvdsrex 14118 aprval 14302 aprap 14306 psrval 14686 psrbasg 14694 psrplusgg 14698 lmfval 14923 txbasex 14987 txopn 14995 txcn 15005 txrest 15006 blfvalps 15115 xmetxp 15237 limccnp2lem 15406 limccnp2cntop 15407 dvfvalap 15411 |
| Copyright terms: Public domain | W3C validator |