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