| 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 e. CPreHilOLD ) -> U = <. ( 1st ` U ) , ( 2nd ` U ) >. ) | 
						
							| 6 | 4 5 | mpan |  |-  ( U e. 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 e. CPreHilOLD -> U e. NrmCVec ) | 
						
							| 10 |  | eqid |  |-  ( 1st ` U ) = ( 1st ` U ) | 
						
							| 11 | 10 | nvvc |  |-  ( U e. NrmCVec -> ( 1st ` U ) e. CVecOLD ) | 
						
							| 12 |  | vcrel |  |-  Rel CVecOLD | 
						
							| 13 |  | 1st2nd |  |-  ( ( Rel CVecOLD /\ ( 1st ` U ) e. CVecOLD ) -> ( 1st ` U ) = <. ( 1st ` ( 1st ` U ) ) , ( 2nd ` ( 1st ` U ) ) >. ) | 
						
							| 14 | 12 13 | mpan |  |-  ( ( 1st ` U ) e. 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 ) e. CVecOLD -> ( 1st ` U ) = <. G , S >. ) | 
						
							| 19 | 9 11 18 | 3syl |  |-  ( U e. CPreHilOLD -> ( 1st ` U ) = <. G , S >. ) | 
						
							| 20 | 19 | opeq1d |  |-  ( U e. CPreHilOLD -> <. ( 1st ` U ) , N >. = <. <. G , S >. , N >. ) | 
						
							| 21 | 8 20 | eqtr3id |  |-  ( U e. CPreHilOLD -> <. ( 1st ` U ) , ( 2nd ` U ) >. = <. <. G , S >. , N >. ) | 
						
							| 22 | 6 21 | eqtrd |  |-  ( U e. CPreHilOLD -> U = <. <. G , S >. , N >. ) |