| Step | Hyp | Ref | Expression | 
						
							| 1 |  | hgmapval.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 | fveq2d |  | 
						
							| 12 | 11 | oveqd |  | 
						
							| 13 | 12 | eqeq2d |  | 
						
							| 14 | 13 | ralbidv |  | 
						
							| 15 | 14 | riotabidv |  | 
						
							| 16 | 15 | mpteq2dv |  | 
						
							| 17 | 16 | eleq2d |  | 
						
							| 18 | 8 17 | sbceqbid |  | 
						
							| 19 | 18 | sbcbidv |  | 
						
							| 20 | 6 19 | sbceqbid |  | 
						
							| 21 | 20 | abbidv |  | 
						
							| 22 | 4 21 | mpteq12dv |  | 
						
							| 23 |  | df-hgmap |  | 
						
							| 24 | 22 23 1 | mptfvmpt |  | 
						
							| 25 | 2 24 | syl |  |