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Description: Part of Lemma F in Crawley p. 116. (Contributed by NM, 12-Apr-2013)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | cdlemf1.l | ⊢ ≤ = ( le ‘ 𝐾 ) | |
| cdlemf1.j | ⊢ ∨ = ( join ‘ 𝐾 ) | ||
| cdlemf1.a | ⊢ 𝐴 = ( Atoms ‘ 𝐾 ) | ||
| cdlemf1.h | ⊢ 𝐻 = ( LHyp ‘ 𝐾 ) | ||
| cdlemf2.m | ⊢ ∧ = ( meet ‘ 𝐾 ) | ||
| Assertion | cdlemf2 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ∃ 𝑝 ∈ 𝐴 ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cdlemf1.l | ⊢ ≤ = ( le ‘ 𝐾 ) | |
| 2 | cdlemf1.j | ⊢ ∨ = ( join ‘ 𝐾 ) | |
| 3 | cdlemf1.a | ⊢ 𝐴 = ( Atoms ‘ 𝐾 ) | |
| 4 | cdlemf1.h | ⊢ 𝐻 = ( LHyp ‘ 𝐾 ) | |
| 5 | cdlemf2.m | ⊢ ∧ = ( meet ‘ 𝐾 ) | |
| 6 | 1 3 4 | lhpexnle | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) → ∃ 𝑝 ∈ 𝐴 ¬ 𝑝 ≤ 𝑊 ) |
| 7 | 6 | adantr | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ∃ 𝑝 ∈ 𝐴 ¬ 𝑝 ≤ 𝑊 ) |
| 8 | 1 2 3 4 | cdlemf1 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ∧ ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ) → ∃ 𝑞 ∈ 𝐴 ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) |
| 9 | simpr1r | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ¬ 𝑝 ≤ 𝑊 ) | |
| 10 | simpr32 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ¬ 𝑞 ≤ 𝑊 ) | |
| 11 | simpr33 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) | |
| 12 | simplrr | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑈 ≤ 𝑊 ) | |
| 13 | hllat | ⊢ ( 𝐾 ∈ HL → 𝐾 ∈ Lat ) | |
| 14 | 13 | ad3antrrr | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝐾 ∈ Lat ) |
| 15 | simplrl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑈 ∈ 𝐴 ) | |
| 16 | eqid | ⊢ ( Base ‘ 𝐾 ) = ( Base ‘ 𝐾 ) | |
| 17 | 16 3 | atbase | ⊢ ( 𝑈 ∈ 𝐴 → 𝑈 ∈ ( Base ‘ 𝐾 ) ) |
| 18 | 15 17 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑈 ∈ ( Base ‘ 𝐾 ) ) |
| 19 | simplll | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝐾 ∈ HL ) | |
| 20 | simpr1l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑝 ∈ 𝐴 ) | |
| 21 | simpr2 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑞 ∈ 𝐴 ) | |
| 22 | 16 2 3 | hlatjcl | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑝 ∈ 𝐴 ∧ 𝑞 ∈ 𝐴 ) → ( 𝑝 ∨ 𝑞 ) ∈ ( Base ‘ 𝐾 ) ) |
| 23 | 19 20 21 22 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ( 𝑝 ∨ 𝑞 ) ∈ ( Base ‘ 𝐾 ) ) |
| 24 | 16 4 | lhpbase | ⊢ ( 𝑊 ∈ 𝐻 → 𝑊 ∈ ( Base ‘ 𝐾 ) ) |
| 25 | 24 | ad3antlr | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑊 ∈ ( Base ‘ 𝐾 ) ) |
| 26 | 16 1 5 | latlem12 | ⊢ ( ( 𝐾 ∈ Lat ∧ ( 𝑈 ∈ ( Base ‘ 𝐾 ) ∧ ( 𝑝 ∨ 𝑞 ) ∈ ( Base ‘ 𝐾 ) ∧ 𝑊 ∈ ( Base ‘ 𝐾 ) ) ) → ( ( 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ∧ 𝑈 ≤ 𝑊 ) ↔ 𝑈 ≤ ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| 27 | 14 18 23 25 26 | syl13anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ( ( 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ∧ 𝑈 ≤ 𝑊 ) ↔ 𝑈 ≤ ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| 28 | 11 12 27 | mpbi2and | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑈 ≤ ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) |
| 29 | hlatl | ⊢ ( 𝐾 ∈ HL → 𝐾 ∈ AtLat ) | |
| 30 | 29 | ad3antrrr | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝐾 ∈ AtLat ) |
| 31 | simpll | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ) | |
| 32 | simpr31 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑝 ≠ 𝑞 ) | |
| 33 | 1 2 5 3 4 | lhpat | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ ( 𝑞 ∈ 𝐴 ∧ 𝑝 ≠ 𝑞 ) ) → ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ∈ 𝐴 ) |
| 34 | 31 20 9 21 32 33 | syl122anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ∈ 𝐴 ) |
| 35 | 1 3 | atcmp | ⊢ ( ( 𝐾 ∈ AtLat ∧ 𝑈 ∈ 𝐴 ∧ ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ∈ 𝐴 ) → ( 𝑈 ≤ ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ↔ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| 36 | 30 15 34 35 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ( 𝑈 ≤ ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ↔ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| 37 | 28 36 | mpbid | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) |
| 38 | 9 10 37 | jca31 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) ∧ ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ∧ 𝑞 ∈ 𝐴 ∧ ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) ) ) → ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| 39 | 38 | 3exp2 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) → ( 𝑞 ∈ 𝐴 → ( ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) → ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) ) ) ) |
| 40 | 39 | 3impia | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ∧ ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ) → ( 𝑞 ∈ 𝐴 → ( ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) → ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) ) ) |
| 41 | 40 | reximdvai | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ∧ ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ) → ( ∃ 𝑞 ∈ 𝐴 ( 𝑝 ≠ 𝑞 ∧ ¬ 𝑞 ≤ 𝑊 ∧ 𝑈 ≤ ( 𝑝 ∨ 𝑞 ) ) → ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) ) |
| 42 | 8 41 | mpd | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ∧ ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) ) → ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |
| 43 | 42 | 3expia | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ( ( 𝑝 ∈ 𝐴 ∧ ¬ 𝑝 ≤ 𝑊 ) → ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) ) |
| 44 | 43 | expd | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ( 𝑝 ∈ 𝐴 → ( ¬ 𝑝 ≤ 𝑊 → ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) ) ) |
| 45 | 44 | reximdvai | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ( ∃ 𝑝 ∈ 𝐴 ¬ 𝑝 ≤ 𝑊 → ∃ 𝑝 ∈ 𝐴 ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) ) |
| 46 | 7 45 | mpd | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑈 ∈ 𝐴 ∧ 𝑈 ≤ 𝑊 ) ) → ∃ 𝑝 ∈ 𝐴 ∃ 𝑞 ∈ 𝐴 ( ( ¬ 𝑝 ≤ 𝑊 ∧ ¬ 𝑞 ≤ 𝑊 ) ∧ 𝑈 = ( ( 𝑝 ∨ 𝑞 ) ∧ 𝑊 ) ) ) |