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Description: If the modular pair property holds in a sublattice, it holds in the whole lattice. Lemma 1.4 of MaedaMaeda p. 2. (Contributed by NM, 27-Apr-2006) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | mdsl.1 | |- A e. CH |
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| mdsl.2 | |- B e. CH |
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| Assertion | mdsl1i | |- ( A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) <-> A MH B ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mdsl.1 | |- A e. CH |
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| 2 | mdsl.2 | |- B e. CH |
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| 3 | sseq2 | |- ( x = ( y vH ( A i^i B ) ) -> ( ( A i^i B ) C_ x <-> ( A i^i B ) C_ ( y vH ( A i^i B ) ) ) ) |
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| 4 | sseq1 | |- ( x = ( y vH ( A i^i B ) ) -> ( x C_ ( A vH B ) <-> ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) |
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| 5 | 3 4 | anbi12d | |- ( x = ( y vH ( A i^i B ) ) -> ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) <-> ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) ) |
| 6 | sseq1 | |- ( x = ( y vH ( A i^i B ) ) -> ( x C_ B <-> ( y vH ( A i^i B ) ) C_ B ) ) |
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| 7 | oveq1 | |- ( x = ( y vH ( A i^i B ) ) -> ( x vH A ) = ( ( y vH ( A i^i B ) ) vH A ) ) |
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| 8 | 7 | ineq1d | |- ( x = ( y vH ( A i^i B ) ) -> ( ( x vH A ) i^i B ) = ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) ) |
| 9 | oveq1 | |- ( x = ( y vH ( A i^i B ) ) -> ( x vH ( A i^i B ) ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) |
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| 10 | 8 9 | eqeq12d | |- ( x = ( y vH ( A i^i B ) ) -> ( ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) <-> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) |
| 11 | 6 10 | imbi12d | |- ( x = ( y vH ( A i^i B ) ) -> ( ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) <-> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) |
| 12 | 5 11 | imbi12d | |- ( x = ( y vH ( A i^i B ) ) -> ( ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) <-> ( ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) ) |
| 13 | 12 | rspccv | |- ( A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) -> ( ( y vH ( A i^i B ) ) e. CH -> ( ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) ) |
| 14 | impexp | |- ( ( ( ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) /\ ( y vH ( A i^i B ) ) C_ B ) -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) <-> ( ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) |
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| 15 | impexp | |- ( ( ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) <-> ( ( y vH ( A i^i B ) ) e. CH -> ( ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) ) |
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| 16 | 14 15 | bitr2i | |- ( ( ( y vH ( A i^i B ) ) e. CH -> ( ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) <-> ( ( ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) /\ ( y vH ( A i^i B ) ) C_ B ) -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) |
| 17 | inss2 | |- ( A i^i B ) C_ B |
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| 18 | 1 2 | chincli | |- ( A i^i B ) e. CH |
| 19 | chlub | |- ( ( y e. CH /\ ( A i^i B ) e. CH /\ B e. CH ) -> ( ( y C_ B /\ ( A i^i B ) C_ B ) <-> ( y vH ( A i^i B ) ) C_ B ) ) |
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| 20 | 18 2 19 | mp3an23 | |- ( y e. CH -> ( ( y C_ B /\ ( A i^i B ) C_ B ) <-> ( y vH ( A i^i B ) ) C_ B ) ) |
| 21 | 20 | biimpd | |- ( y e. CH -> ( ( y C_ B /\ ( A i^i B ) C_ B ) -> ( y vH ( A i^i B ) ) C_ B ) ) |
| 22 | 17 21 | mpan2i | |- ( y e. CH -> ( y C_ B -> ( y vH ( A i^i B ) ) C_ B ) ) |
| 23 | 2 1 | chub2i | |- B C_ ( A vH B ) |
| 24 | sstr | |- ( ( ( y vH ( A i^i B ) ) C_ B /\ B C_ ( A vH B ) ) -> ( y vH ( A i^i B ) ) C_ ( A vH B ) ) |
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| 25 | 23 24 | mpan2 | |- ( ( y vH ( A i^i B ) ) C_ B -> ( y vH ( A i^i B ) ) C_ ( A vH B ) ) |
| 26 | 22 25 | syl6 | |- ( y e. CH -> ( y C_ B -> ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) |
| 27 | chub2 | |- ( ( ( A i^i B ) e. CH /\ y e. CH ) -> ( A i^i B ) C_ ( y vH ( A i^i B ) ) ) |
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| 28 | 18 27 | mpan | |- ( y e. CH -> ( A i^i B ) C_ ( y vH ( A i^i B ) ) ) |
| 29 | 26 28 | jctild | |- ( y e. CH -> ( y C_ B -> ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) ) |
| 30 | chjcl | |- ( ( y e. CH /\ ( A i^i B ) e. CH ) -> ( y vH ( A i^i B ) ) e. CH ) |
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| 31 | 18 30 | mpan2 | |- ( y e. CH -> ( y vH ( A i^i B ) ) e. CH ) |
| 32 | 29 31 | jctild | |- ( y e. CH -> ( y C_ B -> ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) ) ) |
| 33 | 32 22 | jcad | |- ( y e. CH -> ( y C_ B -> ( ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) /\ ( y vH ( A i^i B ) ) C_ B ) ) ) |
| 34 | chjass | |- ( ( y e. CH /\ ( A i^i B ) e. CH /\ A e. CH ) -> ( ( y vH ( A i^i B ) ) vH A ) = ( y vH ( ( A i^i B ) vH A ) ) ) |
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| 35 | 18 1 34 | mp3an23 | |- ( y e. CH -> ( ( y vH ( A i^i B ) ) vH A ) = ( y vH ( ( A i^i B ) vH A ) ) ) |
| 36 | 18 1 | chjcomi | |- ( ( A i^i B ) vH A ) = ( A vH ( A i^i B ) ) |
| 37 | 1 2 | chabs1i | |- ( A vH ( A i^i B ) ) = A |
| 38 | 36 37 | eqtri | |- ( ( A i^i B ) vH A ) = A |
| 39 | 38 | oveq2i | |- ( y vH ( ( A i^i B ) vH A ) ) = ( y vH A ) |
| 40 | 35 39 | eqtrdi | |- ( y e. CH -> ( ( y vH ( A i^i B ) ) vH A ) = ( y vH A ) ) |
| 41 | 40 | ineq1d | |- ( y e. CH -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH A ) i^i B ) ) |
| 42 | chjass | |- ( ( y e. CH /\ ( A i^i B ) e. CH /\ ( A i^i B ) e. CH ) -> ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) = ( y vH ( ( A i^i B ) vH ( A i^i B ) ) ) ) |
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| 43 | 18 18 42 | mp3an23 | |- ( y e. CH -> ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) = ( y vH ( ( A i^i B ) vH ( A i^i B ) ) ) ) |
| 44 | 18 | chjidmi | |- ( ( A i^i B ) vH ( A i^i B ) ) = ( A i^i B ) |
| 45 | 44 | oveq2i | |- ( y vH ( ( A i^i B ) vH ( A i^i B ) ) ) = ( y vH ( A i^i B ) ) |
| 46 | 43 45 | eqtrdi | |- ( y e. CH -> ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) = ( y vH ( A i^i B ) ) ) |
| 47 | 41 46 | eqeq12d | |- ( y e. CH -> ( ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) <-> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) |
| 48 | 47 | biimpd | |- ( y e. CH -> ( ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) |
| 49 | 33 48 | imim12d | |- ( y e. CH -> ( ( ( ( ( y vH ( A i^i B ) ) e. CH /\ ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) ) /\ ( y vH ( A i^i B ) ) C_ B ) -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) -> ( y C_ B -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) ) |
| 50 | 16 49 | biimtrid | |- ( y e. CH -> ( ( ( y vH ( A i^i B ) ) e. CH -> ( ( ( A i^i B ) C_ ( y vH ( A i^i B ) ) /\ ( y vH ( A i^i B ) ) C_ ( A vH B ) ) -> ( ( y vH ( A i^i B ) ) C_ B -> ( ( ( y vH ( A i^i B ) ) vH A ) i^i B ) = ( ( y vH ( A i^i B ) ) vH ( A i^i B ) ) ) ) ) -> ( y C_ B -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) ) |
| 51 | 13 50 | syl5com | |- ( A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) -> ( y e. CH -> ( y C_ B -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) ) |
| 52 | 51 | ralrimiv | |- ( A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) -> A. y e. CH ( y C_ B -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) |
| 53 | mdbr | |- ( ( A e. CH /\ B e. CH ) -> ( A MH B <-> A. y e. CH ( y C_ B -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) ) |
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| 54 | 1 2 53 | mp2an | |- ( A MH B <-> A. y e. CH ( y C_ B -> ( ( y vH A ) i^i B ) = ( y vH ( A i^i B ) ) ) ) |
| 55 | 52 54 | sylibr | |- ( A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) -> A MH B ) |
| 56 | mdbr | |- ( ( A e. CH /\ B e. CH ) -> ( A MH B <-> A. x e. CH ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) ) |
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| 57 | 1 2 56 | mp2an | |- ( A MH B <-> A. x e. CH ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) |
| 58 | ax-1 | |- ( ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) -> ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) ) |
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| 59 | 58 | ralimi | |- ( A. x e. CH ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) -> A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) ) |
| 60 | 57 59 | sylbi | |- ( A MH B -> A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) ) |
| 61 | 55 60 | impbii | |- ( A. x e. CH ( ( ( A i^i B ) C_ x /\ x C_ ( A vH B ) ) -> ( x C_ B -> ( ( x vH A ) i^i B ) = ( x vH ( A i^i B ) ) ) ) <-> A MH B ) |