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| Mirrors > Home > MPE Home > Th. List > xpexg | Structured version Visualization version GIF version | ||
| Description: The Cartesian product of two sets is a set. Proposition 6.2 of [TakeutiZaring] p. 23. See also xpexgALT 7987. (Contributed by NM, 14-Aug-1994.) |
| Ref | Expression |
|---|---|
| xpexg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 × 𝐵) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xpsspw 5801 | . 2 ⊢ (𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) | |
| 2 | unexg 7754 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) | |
| 3 | pwexg 5354 | . . 3 ⊢ ((𝐴 ∪ 𝐵) ∈ V → 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 4 | pwexg 5354 | . . 3 ⊢ (𝒫 (𝐴 ∪ 𝐵) ∈ V → 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) | |
| 5 | 2, 3, 4 | 3syl 19 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) |
| 6 | ssexg 5295 | . 2 ⊢ (((𝐴 × 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝐵) ∧ 𝒫 𝒫 (𝐴 ∪ 𝐵) ∈ V) → (𝐴 × 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 599 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 × 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 Vcvv 3458 ∪ cun 3906 ⊆ wss 3908 𝒫 cpw 4567 × cxp 5664 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-pow 5341 ax-pr 5409 ax-un 7745 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-opab 5179 df-xp 5672 df-rel 5673 |
| This theorem is used by: xpexd 7759 3xpexg 7760 xpex 7761 sqxpexg 7763 coexg 7935 fex2 7942 resfunexgALT 7954 fnexALT 7957 funexw 7958 opabex3d 7971 opabex3rd 7972 opabex3 7973 mpoexxg 8081 fnwelem 8136 naddunif 8689 pmex 8838 pmvalg 8843 elpmg 8849 fvdiagfn 8898 ixpexg 8929 snmapen 9045 xpdom2 9070 xpdom3 9073 omxpen 9077 fodomr 9126 disjenex 9133 domssex2 9135 domssex 9136 mapxpen 9141 fczfsuppd 9356 brwdom2 9545 xpwdomg 9557 unxpwdom2 9560 djuex 9913 djuexALT 9927 fseqen 10030 djuassen 10181 mapdjuen 10183 djudom1 10185 djuinf 10191 hsmexlem2 10429 axdc2lem 10450 iundom2g 10542 fpwwe2lem12 10645 pwsbas 17565 pwsle 17571 pwssca 17575 isga 19392 efgtf 19823 frgpcpbl 19860 frgp0 19861 frgpeccl 19862 frgpadd 19864 frgpmhm 19866 vrgpf 19869 vrgpinv 19870 frgpupf 19874 frgpup1 19876 frgpup2 19877 frgpup3lem 19878 frgpnabllem1 19974 frgpnabllem2 19975 gsum2d2 20075 gsumcom2 20076 dprd2da 20145 pwssplit3 21219 mpofrlmd 21964 frlmip 21965 mattposvs 22649 mat1dimelbas 22665 mdetrlin 22796 lmfval 23426 txbasex 23760 txopn 23796 txrest 23825 txindislem 23827 xkoinjcn 23881 blfvalps 24577 bcthlem1 25520 bcthlem5 25524 rrxip 25586 isvcOLD 30968 resf1o 33112 locfinref 34262 esum2dlem 34513 esum2d 34514 elsx 34616 satfv0 35871 satf00 35887 filnetlem3 36932 filnetlem4 36933 bj-xpexg2 37637 inxpex 39029 xrninxpex 39107 aks6d1c2 42938 relexpxpnnidm 44470 enrelmap 44764 mpoexxg2 49159 eufsn2 49662 |
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