| Step | Hyp | Ref | Expression | 
						
							| 1 |  | prproropf1o.o | ⊢ 𝑂  =  ( 𝑅  ∩  ( 𝑉  ×  𝑉 ) ) | 
						
							| 2 |  | prproropf1o.p | ⊢ 𝑃  =  { 𝑝  ∈  𝒫  𝑉  ∣  ( ♯ ‘ 𝑝 )  =  2 } | 
						
							| 3 |  | prproropf1o.f | ⊢ 𝐹  =  ( 𝑝  ∈  𝑃  ↦  〈 inf ( 𝑝 ,  𝑉 ,  𝑅 ) ,  sup ( 𝑝 ,  𝑉 ,  𝑅 ) 〉 ) | 
						
							| 4 |  | infeq1 | ⊢ ( 𝑝  =  { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) }  →  inf ( 𝑝 ,  𝑉 ,  𝑅 )  =  inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) ) | 
						
							| 5 |  | supeq1 | ⊢ ( 𝑝  =  { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) }  →  sup ( 𝑝 ,  𝑉 ,  𝑅 )  =  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) ) | 
						
							| 6 | 4 5 | opeq12d | ⊢ ( 𝑝  =  { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) }  →  〈 inf ( 𝑝 ,  𝑉 ,  𝑅 ) ,  sup ( 𝑝 ,  𝑉 ,  𝑅 ) 〉  =  〈 inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) ,  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) 〉 ) | 
						
							| 7 | 1 | prproropf1olem0 | ⊢ ( 𝑊  ∈  𝑂  ↔  ( 𝑊  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉  ∧  ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) ) | 
						
							| 8 |  | simpl | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  𝑅  Or  𝑉 ) | 
						
							| 9 |  | simprll | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  ( 1st  ‘ 𝑊 )  ∈  𝑉 ) | 
						
							| 10 |  | simprlr | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  ( 2nd  ‘ 𝑊 )  ∈  𝑉 ) | 
						
							| 11 |  | infpr | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  →  inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 )  =  if ( ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) ) ) | 
						
							| 12 | 8 9 10 11 | syl3anc | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 )  =  if ( ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) ) ) | 
						
							| 13 |  | iftrue | ⊢ ( ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 )  →  if ( ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) )  =  ( 1st  ‘ 𝑊 ) ) | 
						
							| 14 | 13 | ad2antll | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  if ( ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) )  =  ( 1st  ‘ 𝑊 ) ) | 
						
							| 15 | 12 14 | eqtrd | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 )  =  ( 1st  ‘ 𝑊 ) ) | 
						
							| 16 |  | suppr | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  →  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 )  =  if ( ( 2nd  ‘ 𝑊 ) 𝑅 ( 1st  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) ) ) | 
						
							| 17 | 8 9 10 16 | syl3anc | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 )  =  if ( ( 2nd  ‘ 𝑊 ) 𝑅 ( 1st  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) ) ) | 
						
							| 18 |  | soasym | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 ) )  →  ( ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 )  →  ¬  ( 2nd  ‘ 𝑊 ) 𝑅 ( 1st  ‘ 𝑊 ) ) ) | 
						
							| 19 | 18 | impr | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  ¬  ( 2nd  ‘ 𝑊 ) 𝑅 ( 1st  ‘ 𝑊 ) ) | 
						
							| 20 | 19 | iffalsed | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  if ( ( 2nd  ‘ 𝑊 ) 𝑅 ( 1st  ‘ 𝑊 ) ,  ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) )  =  ( 2nd  ‘ 𝑊 ) ) | 
						
							| 21 | 17 20 | eqtrd | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 )  =  ( 2nd  ‘ 𝑊 ) ) | 
						
							| 22 | 15 21 | opeq12d | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  〈 inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) ,  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) 〉  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉 ) | 
						
							| 23 | 22 | 3adantr1 | ⊢ ( ( 𝑅  Or  𝑉  ∧  ( 𝑊  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉  ∧  ( ( 1st  ‘ 𝑊 )  ∈  𝑉  ∧  ( 2nd  ‘ 𝑊 )  ∈  𝑉 )  ∧  ( 1st  ‘ 𝑊 ) 𝑅 ( 2nd  ‘ 𝑊 ) ) )  →  〈 inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) ,  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) 〉  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉 ) | 
						
							| 24 | 7 23 | sylan2b | ⊢ ( ( 𝑅  Or  𝑉  ∧  𝑊  ∈  𝑂 )  →  〈 inf ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) ,  sup ( { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } ,  𝑉 ,  𝑅 ) 〉  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉 ) | 
						
							| 25 | 6 24 | sylan9eqr | ⊢ ( ( ( 𝑅  Or  𝑉  ∧  𝑊  ∈  𝑂 )  ∧  𝑝  =  { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } )  →  〈 inf ( 𝑝 ,  𝑉 ,  𝑅 ) ,  sup ( 𝑝 ,  𝑉 ,  𝑅 ) 〉  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉 ) | 
						
							| 26 | 1 2 | prproropf1olem1 | ⊢ ( ( 𝑅  Or  𝑉  ∧  𝑊  ∈  𝑂 )  →  { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) }  ∈  𝑃 ) | 
						
							| 27 |  | opex | ⊢ 〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉  ∈  V | 
						
							| 28 | 27 | a1i | ⊢ ( ( 𝑅  Or  𝑉  ∧  𝑊  ∈  𝑂 )  →  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉  ∈  V ) | 
						
							| 29 | 3 25 26 28 | fvmptd2 | ⊢ ( ( 𝑅  Or  𝑉  ∧  𝑊  ∈  𝑂 )  →  ( 𝐹 ‘ { ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) } )  =  〈 ( 1st  ‘ 𝑊 ) ,  ( 2nd  ‘ 𝑊 ) 〉 ) |