| Step | Hyp | Ref | Expression | 
						
							| 1 |  | hdmap1val.h |  | 
						
							| 2 |  | elex |  | 
						
							| 3 |  | fveq2 |  | 
						
							| 4 | 3 1 | eqtr4di |  | 
						
							| 5 |  | fveq2 |  | 
						
							| 6 | 5 | fveq1d |  | 
						
							| 7 |  | fveq2 |  | 
						
							| 8 | 7 | fveq1d |  | 
						
							| 9 |  | fveq2 |  | 
						
							| 10 | 9 | fveq1d |  | 
						
							| 11 | 10 | sbceq1d |  | 
						
							| 12 | 11 | sbcbidv |  | 
						
							| 13 | 12 | sbcbidv |  | 
						
							| 14 | 8 13 | sbceqbid |  | 
						
							| 15 | 14 | sbcbidv |  | 
						
							| 16 | 15 | sbcbidv |  | 
						
							| 17 | 6 16 | sbceqbid |  | 
						
							| 18 | 17 | abbidv |  | 
						
							| 19 | 4 18 | mpteq12dv |  | 
						
							| 20 |  | df-hdmap1 |  | 
						
							| 21 | 19 20 1 | mptfvmpt |  | 
						
							| 22 | 2 21 | syl |  |