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Description: Binary relation expressing the modular pair property. This version quantifies an ordering instead of an inference. (Contributed by NM, 6-Jul-2004) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | mdbr4 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 𝑀ℋ 𝐵 ↔ ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mdbr2 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 𝑀ℋ 𝐵 ↔ ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) ) | |
| 2 | chincl | ⊢ ( ( 𝑥 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝑥 ∩ 𝐵 ) ∈ Cℋ ) | |
| 3 | inss2 | ⊢ ( 𝑥 ∩ 𝐵 ) ⊆ 𝐵 | |
| 4 | sseq1 | ⊢ ( 𝑦 = ( 𝑥 ∩ 𝐵 ) → ( 𝑦 ⊆ 𝐵 ↔ ( 𝑥 ∩ 𝐵 ) ⊆ 𝐵 ) ) | |
| 5 | oveq1 | ⊢ ( 𝑦 = ( 𝑥 ∩ 𝐵 ) → ( 𝑦 ∨ℋ 𝐴 ) = ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ) | |
| 6 | 5 | ineq1d | ⊢ ( 𝑦 = ( 𝑥 ∩ 𝐵 ) → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) = ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ) |
| 7 | oveq1 | ⊢ ( 𝑦 = ( 𝑥 ∩ 𝐵 ) → ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) = ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) | |
| 8 | 6 7 | sseq12d | ⊢ ( 𝑦 = ( 𝑥 ∩ 𝐵 ) → ( ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ↔ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 9 | 4 8 | imbi12d | ⊢ ( 𝑦 = ( 𝑥 ∩ 𝐵 ) → ( ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ↔ ( ( 𝑥 ∩ 𝐵 ) ⊆ 𝐵 → ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) ) |
| 10 | 9 | rspcv | ⊢ ( ( 𝑥 ∩ 𝐵 ) ∈ Cℋ → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) → ( ( 𝑥 ∩ 𝐵 ) ⊆ 𝐵 → ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) ) |
| 11 | 3 10 | mpii | ⊢ ( ( 𝑥 ∩ 𝐵 ) ∈ Cℋ → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) → ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 12 | 2 11 | syl | ⊢ ( ( 𝑥 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) → ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 13 | 12 | ex | ⊢ ( 𝑥 ∈ Cℋ → ( 𝐵 ∈ Cℋ → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) → ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) ) |
| 14 | 13 | com3l | ⊢ ( 𝐵 ∈ Cℋ → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) → ( 𝑥 ∈ Cℋ → ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) ) |
| 15 | 14 | ralrimdv | ⊢ ( 𝐵 ∈ Cℋ → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) → ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 16 | dfss | ⊢ ( 𝑥 ⊆ 𝐵 ↔ 𝑥 = ( 𝑥 ∩ 𝐵 ) ) | |
| 17 | 16 | biimpi | ⊢ ( 𝑥 ⊆ 𝐵 → 𝑥 = ( 𝑥 ∩ 𝐵 ) ) |
| 18 | 17 | oveq1d | ⊢ ( 𝑥 ⊆ 𝐵 → ( 𝑥 ∨ℋ 𝐴 ) = ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ) |
| 19 | 18 | ineq1d | ⊢ ( 𝑥 ⊆ 𝐵 → ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) = ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ) |
| 20 | 17 | oveq1d | ⊢ ( 𝑥 ⊆ 𝐵 → ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) = ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) |
| 21 | 19 20 | sseq12d | ⊢ ( 𝑥 ⊆ 𝐵 → ( ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ↔ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 22 | 21 | biimprcd | ⊢ ( ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) → ( 𝑥 ⊆ 𝐵 → ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 23 | 22 | ralimi | ⊢ ( ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) → ∀ 𝑥 ∈ Cℋ ( 𝑥 ⊆ 𝐵 → ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 24 | sseq1 | ⊢ ( 𝑥 = 𝑦 → ( 𝑥 ⊆ 𝐵 ↔ 𝑦 ⊆ 𝐵 ) ) | |
| 25 | oveq1 | ⊢ ( 𝑥 = 𝑦 → ( 𝑥 ∨ℋ 𝐴 ) = ( 𝑦 ∨ℋ 𝐴 ) ) | |
| 26 | 25 | ineq1d | ⊢ ( 𝑥 = 𝑦 → ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) = ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ) |
| 27 | oveq1 | ⊢ ( 𝑥 = 𝑦 → ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) = ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) | |
| 28 | 26 27 | sseq12d | ⊢ ( 𝑥 = 𝑦 → ( ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ↔ ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 29 | 24 28 | imbi12d | ⊢ ( 𝑥 = 𝑦 → ( ( 𝑥 ⊆ 𝐵 → ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ↔ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) ) |
| 30 | 29 | cbvralvw | ⊢ ( ∀ 𝑥 ∈ Cℋ ( 𝑥 ⊆ 𝐵 → ( ( 𝑥 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑥 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ↔ ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 31 | 23 30 | sylib | ⊢ ( ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) → ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 32 | 15 31 | impbid1 | ⊢ ( 𝐵 ∈ Cℋ → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ↔ ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 33 | 32 | adantl | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( ∀ 𝑦 ∈ Cℋ ( 𝑦 ⊆ 𝐵 → ( ( 𝑦 ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( 𝑦 ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ↔ ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |
| 34 | 1 33 | bitrd | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 𝑀ℋ 𝐵 ↔ ∀ 𝑥 ∈ Cℋ ( ( ( 𝑥 ∩ 𝐵 ) ∨ℋ 𝐴 ) ∩ 𝐵 ) ⊆ ( ( 𝑥 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐵 ) ) ) ) |