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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 6253 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7876 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7877 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7727 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 606 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5276 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 596 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 399 ∈ wcel 2141 Vcvv 3453 ⊆ wss 3902 × cxp 5641 dom cdm 5643 ran crn 5644 ∘ ccom 5647 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-sep 5243 ax-pow 5319 ax-pr 5387 ax-un 7712 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-br 5098 df-opab 5160 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 |
| This theorem is referenced by: coex 7905 coexd 7906 suppco 8179 fsuppco2 9342 fsuppcor 9343 mapfienlem2 9345 wemapwe 9645 cofsmo 10219 relexpsucnnr 15031 supcvg 15876 imasle 17543 setcco 18106 estrcco 18152 pwsco1mhm 18856 pwsco2mhm 18857 efmndov 18905 efmndcl 18906 symgov 19414 symgcl 19415 gsumval3lem2 19936 gsumzf1o 19942 f1lindf 21861 evls1sca 22373 tngds 24695 climcncf 24949 motplusg 28698 tocycfv 33249 smatfval 34052 eulerpartlemmf 34632 hgt750lemg 34908 cossex 38968 tgrpov 41332 erngmul 41390 erngmul-rN 41398 dvamulr 41596 dvavadd 41599 dvhmulr 41670 mendmulr 43721 relexp0a 44252 choicefi 45737 climexp 46141 dvsinax 46447 stoweidlem27 46561 stoweidlem31 46565 stoweidlem59 46593 grimco 48471 uspgrbisymrelALT 48737 rngccoALTV 48853 ringccoALTV 48887 itcoval1 49245 itcoval2 49246 itcoval3 49247 itcovalsucov 49250 |
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