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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 6236 | . 2 ⊢ (𝐴 ∘ 𝐵) ⊆ (dom 𝐵 × ran 𝐴) | |
| 2 | dmexg 7852 | . . 3 ⊢ (𝐵 ∈ 𝑊 → dom 𝐵 ∈ V) | |
| 3 | rnexg 7853 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V) | |
| 4 | xpexg 7704 | . . 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 5264 | . 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 3429 ⊆ wss 3889 × cxp 5629 dom cdm 5631 ran crn 5632 ∘ ccom 5635 |
| 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 2708 ax-sep 5231 ax-pow 5307 ax-pr 5375 ax-un 7689 |
| 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 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 |
| This theorem is referenced by: coex 7881 coexd 7882 suppco 8156 fsuppco2 9316 fsuppcor 9317 mapfienlem2 9319 wemapwe 9618 cofsmo 10191 relexpsucnnr 14987 supcvg 15821 imasle 17487 setcco 18050 estrcco 18096 pwsco1mhm 18800 pwsco2mhm 18801 efmndov 18849 efmndcl 18850 symgov 19359 symgcl 19360 gsumval3lem2 19881 gsumzf1o 19887 f1lindf 21802 evls1sca 22288 tngds 24613 climcncf 24867 motplusg 28610 tocycfv 33170 smatfval 33939 eulerpartlemmf 34519 hgt750lemg 34798 cossex 38830 tgrpov 41194 erngmul 41252 erngmul-rN 41260 dvamulr 41458 dvavadd 41461 dvhmulr 41532 mendmulr 43612 relexp0a 44143 choicefi 45629 climexp 46035 dvsinax 46341 stoweidlem27 46455 stoweidlem31 46459 stoweidlem59 46487 grimco 48365 uspgrbisymrelALT 48631 rngccoALTV 48747 ringccoALTV 48781 itcoval1 49139 itcoval2 49140 itcoval3 49141 itcovalsucov 49144 |
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