| Step | Hyp | Ref | Expression | 
						
							| 1 |  | phop.2 | ⊢ 𝐺  =  (  +𝑣  ‘ 𝑈 ) | 
						
							| 2 |  | phop.4 | ⊢ 𝑆  =  (  ·𝑠OLD  ‘ 𝑈 ) | 
						
							| 3 |  | phop.6 | ⊢ 𝑁  =  ( normCV ‘ 𝑈 ) | 
						
							| 4 |  | phrel | ⊢ Rel  CPreHilOLD | 
						
							| 5 |  | 1st2nd | ⊢ ( ( Rel  CPreHilOLD  ∧  𝑈  ∈  CPreHilOLD )  →  𝑈  =  〈 ( 1st  ‘ 𝑈 ) ,  ( 2nd  ‘ 𝑈 ) 〉 ) | 
						
							| 6 | 4 5 | mpan | ⊢ ( 𝑈  ∈  CPreHilOLD  →  𝑈  =  〈 ( 1st  ‘ 𝑈 ) ,  ( 2nd  ‘ 𝑈 ) 〉 ) | 
						
							| 7 | 3 | nmcvfval | ⊢ 𝑁  =  ( 2nd  ‘ 𝑈 ) | 
						
							| 8 | 7 | opeq2i | ⊢ 〈 ( 1st  ‘ 𝑈 ) ,  𝑁 〉  =  〈 ( 1st  ‘ 𝑈 ) ,  ( 2nd  ‘ 𝑈 ) 〉 | 
						
							| 9 |  | phnv | ⊢ ( 𝑈  ∈  CPreHilOLD  →  𝑈  ∈  NrmCVec ) | 
						
							| 10 |  | eqid | ⊢ ( 1st  ‘ 𝑈 )  =  ( 1st  ‘ 𝑈 ) | 
						
							| 11 | 10 | nvvc | ⊢ ( 𝑈  ∈  NrmCVec  →  ( 1st  ‘ 𝑈 )  ∈  CVecOLD ) | 
						
							| 12 |  | vcrel | ⊢ Rel  CVecOLD | 
						
							| 13 |  | 1st2nd | ⊢ ( ( Rel  CVecOLD  ∧  ( 1st  ‘ 𝑈 )  ∈  CVecOLD )  →  ( 1st  ‘ 𝑈 )  =  〈 ( 1st  ‘ ( 1st  ‘ 𝑈 ) ) ,  ( 2nd  ‘ ( 1st  ‘ 𝑈 ) ) 〉 ) | 
						
							| 14 | 12 13 | mpan | ⊢ ( ( 1st  ‘ 𝑈 )  ∈  CVecOLD  →  ( 1st  ‘ 𝑈 )  =  〈 ( 1st  ‘ ( 1st  ‘ 𝑈 ) ) ,  ( 2nd  ‘ ( 1st  ‘ 𝑈 ) ) 〉 ) | 
						
							| 15 | 1 | vafval | ⊢ 𝐺  =  ( 1st  ‘ ( 1st  ‘ 𝑈 ) ) | 
						
							| 16 | 2 | smfval | ⊢ 𝑆  =  ( 2nd  ‘ ( 1st  ‘ 𝑈 ) ) | 
						
							| 17 | 15 16 | opeq12i | ⊢ 〈 𝐺 ,  𝑆 〉  =  〈 ( 1st  ‘ ( 1st  ‘ 𝑈 ) ) ,  ( 2nd  ‘ ( 1st  ‘ 𝑈 ) ) 〉 | 
						
							| 18 | 14 17 | eqtr4di | ⊢ ( ( 1st  ‘ 𝑈 )  ∈  CVecOLD  →  ( 1st  ‘ 𝑈 )  =  〈 𝐺 ,  𝑆 〉 ) | 
						
							| 19 | 9 11 18 | 3syl | ⊢ ( 𝑈  ∈  CPreHilOLD  →  ( 1st  ‘ 𝑈 )  =  〈 𝐺 ,  𝑆 〉 ) | 
						
							| 20 | 19 | opeq1d | ⊢ ( 𝑈  ∈  CPreHilOLD  →  〈 ( 1st  ‘ 𝑈 ) ,  𝑁 〉  =  〈 〈 𝐺 ,  𝑆 〉 ,  𝑁 〉 ) | 
						
							| 21 | 8 20 | eqtr3id | ⊢ ( 𝑈  ∈  CPreHilOLD  →  〈 ( 1st  ‘ 𝑈 ) ,  ( 2nd  ‘ 𝑈 ) 〉  =  〈 〈 𝐺 ,  𝑆 〉 ,  𝑁 〉 ) | 
						
							| 22 | 6 21 | eqtrd | ⊢ ( 𝑈  ∈  CPreHilOLD  →  𝑈  =  〈 〈 𝐺 ,  𝑆 〉 ,  𝑁 〉 ) |