| Step | Hyp | Ref | Expression | 
						
							| 1 |  | hvmapval.h |  | 
						
							| 2 |  | elex |  | 
						
							| 3 |  | fveq2 |  | 
						
							| 4 | 3 1 | eqtr4di |  | 
						
							| 5 |  | fveq2 |  | 
						
							| 6 | 5 | fveq1d |  | 
						
							| 7 | 6 | fveq2d |  | 
						
							| 8 | 6 | fveq2d |  | 
						
							| 9 | 8 | sneqd |  | 
						
							| 10 | 7 9 | difeq12d |  | 
						
							| 11 | 6 | fveq2d |  | 
						
							| 12 | 11 | fveq2d |  | 
						
							| 13 |  | fveq2 |  | 
						
							| 14 | 13 | fveq1d |  | 
						
							| 15 | 14 | fveq1d |  | 
						
							| 16 | 6 | fveq2d |  | 
						
							| 17 |  | eqidd |  | 
						
							| 18 | 6 | fveq2d |  | 
						
							| 19 | 18 | oveqd |  | 
						
							| 20 | 16 17 19 | oveq123d |  | 
						
							| 21 | 20 | eqeq2d |  | 
						
							| 22 | 15 21 | rexeqbidv |  | 
						
							| 23 | 12 22 | riotaeqbidv |  | 
						
							| 24 | 7 23 | mpteq12dv |  | 
						
							| 25 | 10 24 | mpteq12dv |  | 
						
							| 26 | 4 25 | mpteq12dv |  | 
						
							| 27 |  | df-hvmap |  | 
						
							| 28 | 26 27 1 | mptfvmpt |  | 
						
							| 29 | 2 28 | syl |  |