| Step | Hyp | Ref | Expression | 
						
							| 1 |  | dih1dimat.h |  | 
						
							| 2 |  | dih1dimat.u |  | 
						
							| 3 |  | dih1dimat.i |  | 
						
							| 4 |  | dih1dimat.a |  | 
						
							| 5 |  | eqid |  | 
						
							| 6 |  | eqid |  | 
						
							| 7 |  | eqid |  | 
						
							| 8 |  | eqid |  | 
						
							| 9 |  | eqid |  | 
						
							| 10 |  | eqid |  | 
						
							| 11 |  | eqid |  | 
						
							| 12 |  | eqid |  | 
						
							| 13 |  | eqid |  | 
						
							| 14 |  | eqid |  | 
						
							| 15 |  | eqid |  | 
						
							| 16 |  | eqid |  | 
						
							| 17 |  | eqid |  | 
						
							| 18 |  | eqid |  | 
						
							| 19 |  | eqid |  | 
						
							| 20 |  | eqid |  | 
						
							| 21 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | dih1dimatlem |  |