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Theorem mvdco 18640
 Description: Composing two permutations moves at most the union of the points. (Contributed by Stefan O'Rear, 22-Aug-2015.)
Assertion
Ref Expression
mvdco dom ((𝐹𝐺) ∖ I ) ⊆ (dom (𝐹 ∖ I ) ∪ dom (𝐺 ∖ I ))

Proof of Theorem mvdco
StepHypRef Expression
1 inundif 4375 . . . . . . . 8 ((𝐺 ∩ I ) ∪ (𝐺 ∖ I )) = 𝐺
21coeq2i 5700 . . . . . . 7 (𝐹 ∘ ((𝐺 ∩ I ) ∪ (𝐺 ∖ I ))) = (𝐹𝐺)
3 coundi 6077 . . . . . . 7 (𝐹 ∘ ((𝐺 ∩ I ) ∪ (𝐺 ∖ I ))) = ((𝐹 ∘ (𝐺 ∩ I )) ∪ (𝐹 ∘ (𝐺 ∖ I )))
42, 3eqtr3i 2783 . . . . . 6 (𝐹𝐺) = ((𝐹 ∘ (𝐺 ∩ I )) ∪ (𝐹 ∘ (𝐺 ∖ I )))
54difeq1i 4024 . . . . 5 ((𝐹𝐺) ∖ I ) = (((𝐹 ∘ (𝐺 ∩ I )) ∪ (𝐹 ∘ (𝐺 ∖ I ))) ∖ I )
6 difundir 4185 . . . . 5 (((𝐹 ∘ (𝐺 ∩ I )) ∪ (𝐹 ∘ (𝐺 ∖ I ))) ∖ I ) = (((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ))
75, 6eqtri 2781 . . . 4 ((𝐹𝐺) ∖ I ) = (((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ))
87dmeqi 5744 . . 3 dom ((𝐹𝐺) ∖ I ) = dom (((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ))
9 dmun 5750 . . 3 dom (((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ ((𝐹 ∘ (𝐺 ∖ I )) ∖ I )) = (dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ))
108, 9eqtri 2781 . 2 dom ((𝐹𝐺) ∖ I ) = (dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ))
11 inss2 4134 . . . . . 6 (𝐺 ∩ I ) ⊆ I
12 coss2 5696 . . . . . 6 ((𝐺 ∩ I ) ⊆ I → (𝐹 ∘ (𝐺 ∩ I )) ⊆ (𝐹 ∘ I ))
1311, 12ax-mp 5 . . . . 5 (𝐹 ∘ (𝐺 ∩ I )) ⊆ (𝐹 ∘ I )
14 cocnvcnv1 6087 . . . . . . 7 (𝐹 ∘ I ) = (𝐹 ∘ I )
15 relcnv 5939 . . . . . . . 8 Rel 𝐹
16 coi1 6092 . . . . . . . 8 (Rel 𝐹 → (𝐹 ∘ I ) = 𝐹)
1715, 16ax-mp 5 . . . . . . 7 (𝐹 ∘ I ) = 𝐹
1814, 17eqtr3i 2783 . . . . . 6 (𝐹 ∘ I ) = 𝐹
19 cnvcnvss 6023 . . . . . 6 𝐹𝐹
2018, 19eqsstri 3926 . . . . 5 (𝐹 ∘ I ) ⊆ 𝐹
2113, 20sstri 3901 . . . 4 (𝐹 ∘ (𝐺 ∩ I )) ⊆ 𝐹
22 ssdif 4045 . . . 4 ((𝐹 ∘ (𝐺 ∩ I )) ⊆ 𝐹 → ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ⊆ (𝐹 ∖ I ))
23 dmss 5742 . . . 4 (((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ⊆ (𝐹 ∖ I ) → dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ⊆ dom (𝐹 ∖ I ))
2421, 22, 23mp2b 10 . . 3 dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ⊆ dom (𝐹 ∖ I )
25 difss 4037 . . . . 5 ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ) ⊆ (𝐹 ∘ (𝐺 ∖ I ))
26 dmss 5742 . . . . 5 (((𝐹 ∘ (𝐺 ∖ I )) ∖ I ) ⊆ (𝐹 ∘ (𝐺 ∖ I )) → dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ) ⊆ dom (𝐹 ∘ (𝐺 ∖ I )))
2725, 26ax-mp 5 . . . 4 dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ) ⊆ dom (𝐹 ∘ (𝐺 ∖ I ))
28 dmcoss 5812 . . . 4 dom (𝐹 ∘ (𝐺 ∖ I )) ⊆ dom (𝐺 ∖ I )
2927, 28sstri 3901 . . 3 dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ) ⊆ dom (𝐺 ∖ I )
30 unss12 4087 . . 3 ((dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ⊆ dom (𝐹 ∖ I ) ∧ dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I ) ⊆ dom (𝐺 ∖ I )) → (dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I )) ⊆ (dom (𝐹 ∖ I ) ∪ dom (𝐺 ∖ I )))
3124, 29, 30mp2an 691 . 2 (dom ((𝐹 ∘ (𝐺 ∩ I )) ∖ I ) ∪ dom ((𝐹 ∘ (𝐺 ∖ I )) ∖ I )) ⊆ (dom (𝐹 ∖ I ) ∪ dom (𝐺 ∖ I ))
3210, 31eqsstri 3926 1 dom ((𝐹𝐺) ∖ I ) ⊆ (dom (𝐹 ∖ I ) ∪ dom (𝐺 ∖ I ))
 Colors of variables: wff setvar class Syntax hints:   = wceq 1538   ∖ cdif 3855   ∪ cun 3856   ∩ cin 3857   ⊆ wss 3858   I cid 5429  ◡ccnv 5523  dom cdm 5524   ∘ ccom 5528  Rel wrel 5529 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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5169  ax-nul 5176  ax-pr 5298 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-clab 2736  df-cleq 2750  df-clel 2830  df-ral 3075  df-rex 3076  df-rab 3079  df-v 3411  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-nul 4226  df-if 4421  df-sn 4523  df-pr 4525  df-op 4529  df-br 5033  df-opab 5095  df-id 5430  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-rn 5535  df-res 5536 This theorem is referenced by:  f1omvdco2  18643  symgsssg  18662  symgfisg  18663  symggen  18665  pmtrcnel  30884  pmtrcnel2  30885
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