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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 4867 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4569 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4298 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4298 | . . 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 4254 | . 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 3674 × cxp 4752 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 ax-un 4559 |
| 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 3676 df-sn 3700 df-pr 3701 df-op 3703 df-uni 3920 df-opab 4177 df-xp 4760 |
| This theorem is referenced by: xpexd 4870 xpex 4871 sqxpexg 4873 resiexg 5088 cnvexg 5305 coexg 5312 fex2 5536 fabexg 5559 resfunexgALT 6310 cofunexg 6311 fnexALT 6313 funexw 6314 opabex3d 6323 opabex3 6324 oprabexd 6333 ofmresex 6343 mpoexxg 6419 tposexg 6502 erex 6804 pmex 6900 mapex 6901 pmvalg 6906 elpmg 6911 fvdiagfn 6941 ixpexgg 6970 ixpsnf1o 6984 map1 7067 xpdom2 7095 xpdom3m 7098 xpen 7111 mapxpen 7114 xpfi 7205 djuex 7347 djuassen 7537 cc2lem 7596 shftfvalg 11531 climconst2 12005 mulgnngsum 13884 releqgg 13977 eqgex 13978 eqgfval 13979 prdsval 14119 prdsbaslemss 14120 pwsval 14150 pwsbas 14151 dvdsrvald 14342 dvdsrex 14347 aprval 14533 aprap 14540 psrval 14944 psrbasg 14959 psrplusgg 14963 lmfval 15188 txbasex 15252 txopn 15260 txcn 15270 txrest 15271 blfvalps 15380 xmetxp 15502 limccnp2lem 15671 limccnp2cntop 15672 dvfvalap 15676 |
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