| 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 4833 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4535 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4265 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4265 | . . 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 4223 | . 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 2200 Vcvv 2799 ∪ cun 3195 ⊆ wss 3197 𝒫 cpw 3649 × cxp 4718 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4259 ax-pr 4294 ax-un 4525 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-rex 2514 df-v 2801 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-opab 4146 df-xp 4726 |
| This theorem is referenced by: xpexd 4836 xpex 4837 sqxpexg 4838 resiexg 5053 cnvexg 5269 coexg 5276 fex2 5497 fabexg 5518 resfunexgALT 6262 cofunexg 6263 fnexALT 6265 funexw 6266 opabex3d 6275 opabex3 6276 oprabexd 6281 ofmresex 6291 mpoexxg 6367 tposexg 6415 erex 6717 pmex 6813 mapex 6814 pmvalg 6819 elpmg 6824 fvdiagfn 6853 ixpexgg 6882 ixpsnf1o 6896 map1 6978 xpdom2 7003 xpdom3m 7006 xpen 7019 mapxpen 7022 xpfi 7110 djuex 7226 djuassen 7415 cc2lem 7468 shftfvalg 11350 climconst2 11823 prdsval 13327 prdsbaslemss 13328 pwsval 13345 pwsbas 13346 mulgnngsum 13685 releqgg 13778 eqgex 13779 eqgfval 13780 dvdsrvald 14078 dvdsrex 14083 aprval 14267 aprap 14271 psrval 14651 psrbasg 14659 psrplusgg 14663 lmfval 14888 txbasex 14952 txopn 14960 txcn 14970 txrest 14971 blfvalps 15080 xmetxp 15202 limccnp2lem 15371 limccnp2cntop 15372 dvfvalap 15376 |
| Copyright terms: Public domain | W3C validator |