| Step | Hyp | Ref | Expression | 
						
							| 1 |  | rpvmasum.z |  | 
						
							| 2 |  | rpvmasum.l |  | 
						
							| 3 |  | rpvmasum.a |  | 
						
							| 4 |  | dchrmusum.g |  | 
						
							| 5 |  | dchrmusum.d |  | 
						
							| 6 |  | dchrmusum.1 |  | 
						
							| 7 |  | dchrmusum.b |  | 
						
							| 8 |  | dchrmusum.n1 |  | 
						
							| 9 |  | eqid |  | 
						
							| 10 | 1 2 3 4 5 6 7 8 9 | dchrmusumlema |  | 
						
							| 11 | 3 | adantr |  | 
						
							| 12 | 7 | adantr |  | 
						
							| 13 | 8 | adantr |  | 
						
							| 14 |  | simprl |  | 
						
							| 15 |  | simprrl |  | 
						
							| 16 |  | simprrr |  | 
						
							| 17 | 1 2 11 4 5 6 12 13 9 14 15 16 | dchrmusumlem |  | 
						
							| 18 | 17 | rexlimdvaa |  | 
						
							| 19 | 18 | exlimdv |  | 
						
							| 20 | 10 19 | mpd |  |