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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 6238 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7853 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7854 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7705 | . . 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 5270 | . 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 3442 ⊆ wss 3903 × cxp 5630 dom cdm 5632 ran crn 5633 ∘ ccom 5636 |
| 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 5243 ax-pow 5312 ax-pr 5379 ax-un 7690 |
| 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 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 |
| This theorem is referenced by: coex 7882 coexd 7883 suppco 8158 fsuppco2 9318 fsuppcor 9319 mapfienlem2 9321 wemapwe 9618 cofsmo 10191 relexpsucnnr 14960 supcvg 15791 imasle 17456 setcco 18019 estrcco 18065 pwsco1mhm 18769 pwsco2mhm 18770 efmndov 18818 efmndcl 18819 symgov 19325 symgcl 19326 gsumval3lem2 19847 gsumzf1o 19853 f1lindf 21789 evls1sca 22279 tngds 24604 climcncf 24861 motplusg 28626 tocycfv 33202 smatfval 33972 eulerpartlemmf 34552 hgt750lemg 34831 cossex 38757 tgrpov 41121 erngmul 41179 erngmul-rN 41187 dvamulr 41385 dvavadd 41388 dvhmulr 41459 mendmulr 43538 relexp0a 44069 choicefi 45555 climexp 45962 dvsinax 46268 stoweidlem27 46382 stoweidlem31 46386 stoweidlem59 46414 grimco 48246 uspgrbisymrelALT 48512 rngccoALTV 48628 ringccoALTV 48662 itcoval1 49020 itcoval2 49021 itcoval3 49022 itcovalsucov 49025 |
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