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Mirrors > Home > MPE Home > Th. List > Mathboxes > cossex | Structured version Visualization version GIF version |
Description: If 𝐴 is a set then the class of cosets by 𝐴 is a set. (Contributed by Peter Mazsa, 4-Jan-2019.) |
Ref | Expression |
---|---|
cossex | ⊢ (𝐴 ∈ 𝑉 → ≀ 𝐴 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfcoss3 35656 | . 2 ⊢ ≀ 𝐴 = (𝐴 ∘ ◡𝐴) | |
2 | cnvexg 7623 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ◡𝐴 ∈ V) | |
3 | coexg 7628 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ◡𝐴 ∈ V) → (𝐴 ∘ ◡𝐴) ∈ V) | |
4 | 2, 3 | mpdan 685 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∘ ◡𝐴) ∈ V) |
5 | 1, 4 | eqeltrid 2917 | 1 ⊢ (𝐴 ∈ 𝑉 → ≀ 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2110 Vcvv 3495 ◡ccnv 5549 ∘ ccom 5554 ≀ ccoss 35447 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322 ax-un 7455 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3497 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4833 df-br 5060 df-opab 5122 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-rn 5561 df-coss 35653 |
This theorem is referenced by: cosscnvex 35659 1cosscnvepresex 35660 1cossxrncnvepresex 35661 cosselrels 35730 elfunsALTVfunALTV 35924 |
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