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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 6275 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7899 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7900 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7750 | . . 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 5291 | . 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 2143 Vcvv 3455 ⊆ wss 3906 × cxp 5661 dom cdm 5663 ran crn 5664 ∘ ccom 5667 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5258 ax-pow 5338 ax-pr 5406 ax-un 7734 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-br 5111 df-opab 5175 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 |
| This theorem is referenced by: coex 7928 coexd 7929 suppco 8203 fsuppco2 9364 fsuppcor 9365 mapfienlem2 9367 wemapwe 9667 cofsmo 10254 relexpsucnnr 15064 supcvg 15912 imasle 17578 setcco 18141 estrcco 18187 pwsco1mhm 18892 pwsco2mhm 18893 efmndov 18941 efmndcl 18942 symgov 19455 symgcl 19456 gsumval3lem2 19977 gsumzf1o 19983 f1lindf 21953 evls1sca 22464 tngds 24786 climcncf 25040 motplusg 28792 tocycfv 33410 smatfval 34166 eulerpartlemmf 34746 hgt750lemg 35022 cossex 39139 tgrpov 41503 erngmul 41561 erngmul-rN 41569 dvamulr 41767 dvavadd 41770 dvhmulr 41841 mendmulr 43894 relexp0a 44425 choicefi 45900 climexp 46304 dvsinax 46610 stoweidlem27 46724 stoweidlem31 46728 stoweidlem59 46756 grimco 48637 uspgrbisymrelALT 48903 rngccoALTV 49019 ringccoALTV 49053 itcoval1 49426 itcoval2 49427 itcoval3 49428 itcovalsucov 49431 |
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