| Step | 
						Hyp | 
						Ref | 
						Expression | 
					
						
							| 1 | 
							
								
							 | 
							cdleme4.l | 
							⊢  ≤   =  ( le ‘ 𝐾 )  | 
						
						
							| 2 | 
							
								
							 | 
							cdleme4.j | 
							⊢  ∨   =  ( join ‘ 𝐾 )  | 
						
						
							| 3 | 
							
								
							 | 
							cdleme4.m | 
							⊢  ∧   =  ( meet ‘ 𝐾 )  | 
						
						
							| 4 | 
							
								
							 | 
							cdleme4.a | 
							⊢ 𝐴  =  ( Atoms ‘ 𝐾 )  | 
						
						
							| 5 | 
							
								
							 | 
							cdleme4.h | 
							⊢ 𝐻  =  ( LHyp ‘ 𝐾 )  | 
						
						
							| 6 | 
							
								
							 | 
							cdleme4.u | 
							⊢ 𝑈  =  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 )  | 
						
						
							| 7 | 
							
								
							 | 
							cdleme4.f | 
							⊢ 𝐹  =  ( ( 𝑆  ∨  𝑈 )  ∧  ( 𝑄  ∨  ( ( 𝑃  ∨  𝑆 )  ∧  𝑊 ) ) )  | 
						
						
							| 8 | 
							
								
							 | 
							cdleme4.g | 
							⊢ 𝐺  =  ( ( 𝑃  ∨  𝑄 )  ∧  ( 𝐹  ∨  ( ( 𝑅  ∨  𝑆 )  ∧  𝑊 ) ) )  | 
						
						
							| 9 | 
							
								
							 | 
							simp33 | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) )  | 
						
						
							| 10 | 
							
								
							 | 
							simp11l | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝐾  ∈  HL )  | 
						
						
							| 11 | 
							
								
							 | 
							simp2ll | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑅  ∈  𝐴 )  | 
						
						
							| 12 | 
							
								
							 | 
							simp2rl | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑆  ∈  𝐴 )  | 
						
						
							| 13 | 
							
								
							 | 
							simp11 | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 ) )  | 
						
						
							| 14 | 
							
								
							 | 
							simp12 | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 ) )  | 
						
						
							| 15 | 
							
								
							 | 
							simp13 | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑄  ∈  𝐴 )  | 
						
						
							| 16 | 
							
								
							 | 
							simp31 | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑃  ≠  𝑄 )  | 
						
						
							| 17 | 
							
								1 2 3 4 5 6
							 | 
							lhpat2 | 
							⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  𝑃  ≠  𝑄 ) )  →  𝑈  ∈  𝐴 )  | 
						
						
							| 18 | 
							
								13 14 15 16 17
							 | 
							syl112anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑈  ∈  𝐴 )  | 
						
						
							| 19 | 
							
								10
							 | 
							hllatd | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝐾  ∈  Lat )  | 
						
						
							| 20 | 
							
								
							 | 
							simp12l | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑃  ∈  𝐴 )  | 
						
						
							| 21 | 
							
								
							 | 
							eqid | 
							⊢ ( Base ‘ 𝐾 )  =  ( Base ‘ 𝐾 )  | 
						
						
							| 22 | 
							
								21 2 4
							 | 
							hlatjcl | 
							⊢ ( ( 𝐾  ∈  HL  ∧  𝑃  ∈  𝐴  ∧  𝑄  ∈  𝐴 )  →  ( 𝑃  ∨  𝑄 )  ∈  ( Base ‘ 𝐾 ) )  | 
						
						
							| 23 | 
							
								10 20 15 22
							 | 
							syl3anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑃  ∨  𝑄 )  ∈  ( Base ‘ 𝐾 ) )  | 
						
						
							| 24 | 
							
								
							 | 
							simp11r | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑊  ∈  𝐻 )  | 
						
						
							| 25 | 
							
								21 5
							 | 
							lhpbase | 
							⊢ ( 𝑊  ∈  𝐻  →  𝑊  ∈  ( Base ‘ 𝐾 ) )  | 
						
						
							| 26 | 
							
								24 25
							 | 
							syl | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑊  ∈  ( Base ‘ 𝐾 ) )  | 
						
						
							| 27 | 
							
								21 1 3
							 | 
							latmle2 | 
							⊢ ( ( 𝐾  ∈  Lat  ∧  ( 𝑃  ∨  𝑄 )  ∈  ( Base ‘ 𝐾 )  ∧  𝑊  ∈  ( Base ‘ 𝐾 ) )  →  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 )  ≤  𝑊 )  | 
						
						
							| 28 | 
							
								19 23 26 27
							 | 
							syl3anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 )  ≤  𝑊 )  | 
						
						
							| 29 | 
							
								6 28
							 | 
							eqbrtrid | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑈  ≤  𝑊 )  | 
						
						
							| 30 | 
							
								
							 | 
							simp2lr | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ¬  𝑅  ≤  𝑊 )  | 
						
						
							| 31 | 
							
								
							 | 
							nbrne2 | 
							⊢ ( ( 𝑈  ≤  𝑊  ∧  ¬  𝑅  ≤  𝑊 )  →  𝑈  ≠  𝑅 )  | 
						
						
							| 32 | 
							
								31
							 | 
							necomd | 
							⊢ ( ( 𝑈  ≤  𝑊  ∧  ¬  𝑅  ≤  𝑊 )  →  𝑅  ≠  𝑈 )  | 
						
						
							| 33 | 
							
								29 30 32
							 | 
							syl2anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑅  ≠  𝑈 )  | 
						
						
							| 34 | 
							
								1 2 4
							 | 
							hlatexch1 | 
							⊢ ( ( 𝐾  ∈  HL  ∧  ( 𝑅  ∈  𝐴  ∧  𝑆  ∈  𝐴  ∧  𝑈  ∈  𝐴 )  ∧  𝑅  ≠  𝑈 )  →  ( 𝑅  ≤  ( 𝑈  ∨  𝑆 )  →  𝑆  ≤  ( 𝑈  ∨  𝑅 ) ) )  | 
						
						
							| 35 | 
							
								10 11 12 18 33 34
							 | 
							syl131anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑅  ≤  ( 𝑈  ∨  𝑆 )  →  𝑆  ≤  ( 𝑈  ∨  𝑅 ) ) )  | 
						
						
							| 36 | 
							
								
							 | 
							simp2l | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 ) )  | 
						
						
							| 37 | 
							
								
							 | 
							simp32 | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  𝑅  ≤  ( 𝑃  ∨  𝑄 ) )  | 
						
						
							| 38 | 
							
								1 2 3 4 5 6
							 | 
							cdleme4 | 
							⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  𝑄  ∈  𝐴  ∧  ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 ) )  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 ) )  →  ( 𝑃  ∨  𝑄 )  =  ( 𝑅  ∨  𝑈 ) )  | 
						
						
							| 39 | 
							
								13 20 15 36 37 38
							 | 
							syl131anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑃  ∨  𝑄 )  =  ( 𝑅  ∨  𝑈 ) )  | 
						
						
							| 40 | 
							
								2 4
							 | 
							hlatjcom | 
							⊢ ( ( 𝐾  ∈  HL  ∧  𝑅  ∈  𝐴  ∧  𝑈  ∈  𝐴 )  →  ( 𝑅  ∨  𝑈 )  =  ( 𝑈  ∨  𝑅 ) )  | 
						
						
							| 41 | 
							
								10 11 18 40
							 | 
							syl3anc | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑅  ∨  𝑈 )  =  ( 𝑈  ∨  𝑅 ) )  | 
						
						
							| 42 | 
							
								39 41
							 | 
							eqtrd | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑃  ∨  𝑄 )  =  ( 𝑈  ∨  𝑅 ) )  | 
						
						
							| 43 | 
							
								42
							 | 
							breq2d | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑆  ≤  ( 𝑃  ∨  𝑄 )  ↔  𝑆  ≤  ( 𝑈  ∨  𝑅 ) ) )  | 
						
						
							| 44 | 
							
								35 43
							 | 
							sylibrd | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑅  ≤  ( 𝑈  ∨  𝑆 )  →  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  | 
						
						
							| 45 | 
							
								9 44
							 | 
							mtod | 
							⊢ ( ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  ∧  ( ( 𝑅  ∈  𝐴  ∧  ¬  𝑅  ≤  𝑊 )  ∧  ( 𝑆  ∈  𝐴  ∧  ¬  𝑆  ≤  𝑊 ) )  ∧  ( 𝑃  ≠  𝑄  ∧  𝑅  ≤  ( 𝑃  ∨  𝑄 )  ∧  ¬  𝑆  ≤  ( 𝑃  ∨  𝑄 ) ) )  →  ¬  𝑅  ≤  ( 𝑈  ∨  𝑆 ) )  |