| Step | Hyp | Ref | Expression | 
						
							| 1 |  | djhval.h |  | 
						
							| 2 |  | elex |  | 
						
							| 3 |  | fveq2 |  | 
						
							| 4 | 3 1 | eqtr4di |  | 
						
							| 5 |  | fveq2 |  | 
						
							| 6 | 5 | fveq1d |  | 
						
							| 7 | 6 | fveq2d |  | 
						
							| 8 | 7 | pweqd |  | 
						
							| 9 |  | fveq2 |  | 
						
							| 10 | 9 | fveq1d |  | 
						
							| 11 | 10 | fveq1d |  | 
						
							| 12 | 10 | fveq1d |  | 
						
							| 13 | 11 12 | ineq12d |  | 
						
							| 14 | 10 13 | fveq12d |  | 
						
							| 15 | 8 8 14 | mpoeq123dv |  | 
						
							| 16 | 4 15 | mpteq12dv |  | 
						
							| 17 |  | df-djh |  | 
						
							| 18 | 16 17 1 | mptfvmpt |  | 
						
							| 19 | 2 18 | syl |  |