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| Mirrors > Home > MPE Home > Th. List > coexg | Structured version Visualization version GIF version | ||
| Description: The composition of two sets is a set. (Contributed by NM, 19-Mar-1998.) |
| Ref | Expression |
|---|---|
| coexg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cossxp 6262 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7886 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7887 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7737 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 608 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5283 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 598 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2145 Vcvv 3457 ⊆ wss 3907 × cxp 5649 dom cdm 5651 ran crn 5652 ∘ ccom 5655 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 ax-sep 5250 ax-pow 5326 ax-pr 5394 ax-un 7722 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-br 5105 df-opab 5167 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 |
| This theorem is referenced by: coex 7915 coexd 7916 suppco 8190 fsuppco2 9351 fsuppcor 9352 mapfienlem2 9354 wemapwe 9654 cofsmo 10241 relexpsucnnr 15050 supcvg 15898 imasle 17565 setcco 18128 estrcco 18174 pwsco1mhm 18879 pwsco2mhm 18880 efmndov 18928 efmndcl 18929 symgov 19442 symgcl 19443 gsumval3lem2 19964 gsumzf1o 19970 f1lindf 21929 evls1sca 22440 tngds 24762 climcncf 25016 motplusg 28765 tocycfv 33337 smatfval 34097 eulerpartlemmf 34677 hgt750lemg 34953 cossex 39015 tgrpov 41379 erngmul 41437 erngmul-rN 41445 dvamulr 41643 dvavadd 41646 dvhmulr 41717 mendmulr 43768 relexp0a 44299 choicefi 45776 climexp 46180 dvsinax 46486 stoweidlem27 46600 stoweidlem31 46604 stoweidlem59 46632 grimco 48510 uspgrbisymrelALT 48776 rngccoALTV 48892 ringccoALTV 48926 itcoval1 49295 itcoval2 49296 itcoval3 49297 itcovalsucov 49300 |
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