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Description: Lemma for osumclN . (Contributed by NM, 25-Mar-2012) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | osumcl.p | ⊢ + = ( +𝑃 ‘ 𝐾 ) | |
| osumcl.o | ⊢ ⊥ = ( ⊥𝑃 ‘ 𝐾 ) | ||
| osumcl.c | ⊢ 𝐶 = ( PSubCl ‘ 𝐾 ) | ||
| Assertion | osumcllem11N | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( 𝑋 + 𝑌 ) = ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | osumcl.p | ⊢ + = ( +𝑃 ‘ 𝐾 ) | |
| 2 | osumcl.o | ⊢ ⊥ = ( ⊥𝑃 ‘ 𝐾 ) | |
| 3 | osumcl.c | ⊢ 𝐶 = ( PSubCl ‘ 𝐾 ) | |
| 4 | nonconne | ⊢ ¬ ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) | |
| 5 | simpl1 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → 𝐾 ∈ HL ) | |
| 6 | simpl2 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → 𝑋 ∈ 𝐶 ) | |
| 7 | eqid | ⊢ ( Atoms ‘ 𝐾 ) = ( Atoms ‘ 𝐾 ) | |
| 8 | 7 3 | psubclssatN | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ) → 𝑋 ⊆ ( Atoms ‘ 𝐾 ) ) |
| 9 | 5 6 8 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → 𝑋 ⊆ ( Atoms ‘ 𝐾 ) ) |
| 10 | simpl3 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → 𝑌 ∈ 𝐶 ) | |
| 11 | 7 3 | psubclssatN | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑌 ∈ 𝐶 ) → 𝑌 ⊆ ( Atoms ‘ 𝐾 ) ) |
| 12 | 5 10 11 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → 𝑌 ⊆ ( Atoms ‘ 𝐾 ) ) |
| 13 | 7 1 | paddssat | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑋 ⊆ ( Atoms ‘ 𝐾 ) ∧ 𝑌 ⊆ ( Atoms ‘ 𝐾 ) ) → ( 𝑋 + 𝑌 ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 14 | 5 9 12 13 | syl3anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( 𝑋 + 𝑌 ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 15 | 7 2 | 2polssN | ⊢ ( ( 𝐾 ∈ HL ∧ ( 𝑋 + 𝑌 ) ⊆ ( Atoms ‘ 𝐾 ) ) → ( 𝑋 + 𝑌 ) ⊆ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) |
| 16 | 5 14 15 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( 𝑋 + 𝑌 ) ⊆ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) |
| 17 | df-pss | ⊢ ( ( 𝑋 + 𝑌 ) ⊊ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ↔ ( ( 𝑋 + 𝑌 ) ⊆ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ( 𝑋 + 𝑌 ) ≠ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ) | |
| 18 | pssnel | ⊢ ( ( 𝑋 + 𝑌 ) ⊊ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) → ∃ 𝑝 ( 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) ) | |
| 19 | 17 18 | sylbir | ⊢ ( ( ( 𝑋 + 𝑌 ) ⊆ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ( 𝑋 + 𝑌 ) ≠ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) → ∃ 𝑝 ( 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) ) |
| 20 | df-rex | ⊢ ( ∃ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ↔ ∃ 𝑝 ( 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) ) | |
| 21 | 19 20 | sylibr | ⊢ ( ( ( 𝑋 + 𝑌 ) ⊆ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ( 𝑋 + 𝑌 ) ≠ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) → ∃ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) |
| 22 | eqid | ⊢ ( le ‘ 𝐾 ) = ( le ‘ 𝐾 ) | |
| 23 | eqid | ⊢ ( join ‘ 𝐾 ) = ( join ‘ 𝐾 ) | |
| 24 | eqid | ⊢ ( 𝑋 + { 𝑝 } ) = ( 𝑋 + { 𝑝 } ) | |
| 25 | eqid | ⊢ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) = ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) | |
| 26 | 22 23 7 1 2 3 24 25 | osumcllem9N | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( 𝑋 + { 𝑝 } ) = 𝑋 ) |
| 27 | simp11 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝐾 ∈ HL ) | |
| 28 | simp12 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝑋 ∈ 𝐶 ) | |
| 29 | 27 28 8 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝑋 ⊆ ( Atoms ‘ 𝐾 ) ) |
| 30 | simp13 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝑌 ∈ 𝐶 ) | |
| 31 | 27 30 11 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝑌 ⊆ ( Atoms ‘ 𝐾 ) ) |
| 32 | 14 | 3adantr3 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ) → ( 𝑋 + 𝑌 ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 33 | 32 | 3adant3 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( 𝑋 + 𝑌 ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 34 | 7 2 | polssatN | ⊢ ( ( 𝐾 ∈ HL ∧ ( 𝑋 + 𝑌 ) ⊆ ( Atoms ‘ 𝐾 ) ) → ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 35 | 27 33 34 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 36 | 7 2 | polssatN | ⊢ ( ( 𝐾 ∈ HL ∧ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ⊆ ( Atoms ‘ 𝐾 ) ) → ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 37 | 27 35 36 | syl2anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ⊆ ( Atoms ‘ 𝐾 ) ) |
| 38 | simp23 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) | |
| 39 | 37 38 | sseldd | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → 𝑝 ∈ ( Atoms ‘ 𝐾 ) ) |
| 40 | simp3 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) | |
| 41 | 22 23 7 1 2 3 24 25 | osumcllem10N | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ⊆ ( Atoms ‘ 𝐾 ) ∧ 𝑌 ⊆ ( Atoms ‘ 𝐾 ) ) ∧ 𝑝 ∈ ( Atoms ‘ 𝐾 ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( 𝑋 + { 𝑝 } ) ≠ 𝑋 ) |
| 42 | 27 29 31 39 40 41 | syl311anc | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( 𝑋 + { 𝑝 } ) ≠ 𝑋 ) |
| 43 | 26 42 | pm2.21ddne | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ∧ ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) |
| 44 | 43 | 3exp | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) → ( ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ∧ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) → ( ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) ) ) |
| 45 | 44 | 3expd | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) → ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) → ( 𝑋 ≠ ∅ → ( 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) → ( ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) ) ) ) ) |
| 46 | 45 | imp32 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) → ( ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) ) ) |
| 47 | 46 | rexlimdv | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( ∃ 𝑝 ∈ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ¬ 𝑝 ∈ ( 𝑋 + 𝑌 ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) ) |
| 48 | 21 47 | syl5 | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( ( ( 𝑋 + 𝑌 ) ⊆ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ∧ ( 𝑋 + 𝑌 ) ≠ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) ) |
| 49 | 16 48 | mpand | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( ( 𝑋 + 𝑌 ) ≠ ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) → ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) ) ) |
| 50 | 49 | necon1bd | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( ¬ ( 𝑋 = 𝑋 ∧ 𝑋 ≠ 𝑋 ) → ( 𝑋 + 𝑌 ) = ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) ) |
| 51 | 4 50 | mpi | ⊢ ( ( ( 𝐾 ∈ HL ∧ 𝑋 ∈ 𝐶 ∧ 𝑌 ∈ 𝐶 ) ∧ ( 𝑋 ⊆ ( ⊥ ‘ 𝑌 ) ∧ 𝑋 ≠ ∅ ) ) → ( 𝑋 + 𝑌 ) = ( ⊥ ‘ ( ⊥ ‘ ( 𝑋 + 𝑌 ) ) ) ) |