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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 6230 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7845 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7846 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7697 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 598 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5260 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 588 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 Vcvv 3430 ⊆ wss 3890 × cxp 5622 dom cdm 5624 ran crn 5625 ∘ ccom 5628 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5231 ax-pow 5302 ax-pr 5370 ax-un 7682 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 |
| This theorem is referenced by: coex 7874 coexd 7875 suppco 8149 fsuppco2 9309 fsuppcor 9310 mapfienlem2 9312 wemapwe 9609 cofsmo 10182 relexpsucnnr 14978 supcvg 15812 imasle 17478 setcco 18041 estrcco 18087 pwsco1mhm 18791 pwsco2mhm 18792 efmndov 18840 efmndcl 18841 symgov 19350 symgcl 19351 gsumval3lem2 19872 gsumzf1o 19878 f1lindf 21812 evls1sca 22298 tngds 24623 climcncf 24877 motplusg 28624 tocycfv 33185 smatfval 33955 eulerpartlemmf 34535 hgt750lemg 34814 cossex 38844 tgrpov 41208 erngmul 41266 erngmul-rN 41274 dvamulr 41472 dvavadd 41475 dvhmulr 41546 mendmulr 43630 relexp0a 44161 choicefi 45647 climexp 46053 dvsinax 46359 stoweidlem27 46473 stoweidlem31 46477 stoweidlem59 46505 grimco 48377 uspgrbisymrelALT 48643 rngccoALTV 48759 ringccoALTV 48793 itcoval1 49151 itcoval2 49152 itcoval3 49153 itcovalsucov 49156 |
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