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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 4844 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 4546 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 4276 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 4276 | . . 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 4233 | . 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 2803 ∪ cun 3199 ⊆ wss 3201 𝒫 cpw 3656 × cxp 4729 |
| 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 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-rex 2517 df-v 2805 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-opab 4156 df-xp 4737 |
| This theorem is referenced by: xpexd 4847 xpex 4848 sqxpexg 4849 resiexg 5064 cnvexg 5281 coexg 5288 fex2 5511 fabexg 5532 resfunexgALT 6279 cofunexg 6280 fnexALT 6282 funexw 6283 opabex3d 6292 opabex3 6293 oprabexd 6298 ofmresex 6308 mpoexxg 6384 tposexg 6467 erex 6769 pmex 6865 mapex 6866 pmvalg 6871 elpmg 6876 fvdiagfn 6905 ixpexgg 6934 ixpsnf1o 6948 map1 7030 xpdom2 7058 xpdom3m 7061 xpen 7074 mapxpen 7077 xpfi 7167 djuex 7285 djuassen 7475 cc2lem 7528 shftfvalg 11439 climconst2 11912 prdsval 13417 prdsbaslemss 13418 pwsval 13435 pwsbas 13436 mulgnngsum 13775 releqgg 13868 eqgex 13869 eqgfval 13870 dvdsrvald 14169 dvdsrex 14174 aprval 14358 aprap 14362 psrval 14742 psrbasg 14755 psrplusgg 14759 lmfval 14984 txbasex 15048 txopn 15056 txcn 15066 txrest 15067 blfvalps 15176 xmetxp 15298 limccnp2lem 15467 limccnp2cntop 15468 dvfvalap 15472 |
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