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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 7848 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7849 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7700 | . . 3 ⊢ ((dom 𝐵 ∈ V ∧ ran 𝐴 ∈ V) → (dom 𝐵 × ran 𝐴) ∈ V) | |
| 5 | 2, 3, 4 | syl2anr 603 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (dom 𝐵 × ran 𝐴) ∈ V) |
| 6 | ssexg 5258 | . 2 ⊢ (((𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) ∧ (dom 𝐵 × ran 𝐴) ∈ V) → (𝐴 ∘ 𝐵) ∈ V) | |
| 7 | 1, 5, 6 | sylancr 593 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∘ 𝐵) ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 396 ∈ wcel 2119 Vcvv 3432 ⊆ wss 3890 × cxp 5623 dom cdm 5625 ran crn 5626 ∘ ccom 5629 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2712 ax-sep 5225 ax-pow 5301 ax-pr 5369 ax-un 7685 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2719 df-cleq 2732 df-clel 2815 df-ral 3055 df-rex 3065 df-rab 3393 df-v 3434 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-br 5080 df-opab 5142 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 |
| This theorem is referenced by: coex 7877 coexd 7878 suppco 8153 fsuppco2 9313 fsuppcor 9314 mapfienlem2 9316 wemapwe 9616 cofsmo 10189 relexpsucnnr 14985 supcvg 15819 imasle 17485 setcco 18048 estrcco 18094 pwsco1mhm 18798 pwsco2mhm 18799 efmndov 18847 efmndcl 18848 symgov 19357 symgcl 19358 gsumval3lem2 19879 gsumzf1o 19885 f1lindf 21804 evls1sca 22316 tngds 24638 climcncf 24892 motplusg 28635 tocycfv 33197 smatfval 33986 eulerpartlemmf 34566 hgt750lemg 34845 cossex 38883 tgrpov 41247 erngmul 41305 erngmul-rN 41313 dvamulr 41511 dvavadd 41514 dvhmulr 41585 mendmulr 43636 relexp0a 44167 choicefi 45653 climexp 46057 dvsinax 46363 stoweidlem27 46477 stoweidlem31 46481 stoweidlem59 46509 grimco 48387 uspgrbisymrelALT 48653 rngccoALTV 48769 ringccoALTV 48803 itcoval1 49161 itcoval2 49162 itcoval3 49163 itcovalsucov 49166 |
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