| Step | Hyp | Ref | Expression | 
						
							| 1 |  | dftr2 |  | 
						
							| 2 |  | sssucid |  | 
						
							| 3 |  | idn1 |  | 
						
							| 4 |  | idn2 |  | 
						
							| 5 |  | simpl |  | 
						
							| 6 | 4 5 | e2 |  | 
						
							| 7 |  | idn3 |  | 
						
							| 8 |  | trel |  | 
						
							| 9 | 8 | expd |  | 
						
							| 10 | 3 6 7 9 | e123 |  | 
						
							| 11 |  | ssel |  | 
						
							| 12 | 2 10 11 | e03 |  | 
						
							| 13 | 12 | in3 |  | 
						
							| 14 |  | idn3 |  | 
						
							| 15 |  | eleq2 |  | 
						
							| 16 | 15 | biimpcd |  | 
						
							| 17 | 6 14 16 | e23 |  | 
						
							| 18 | 2 17 11 | e03 |  | 
						
							| 19 | 18 | in3 |  | 
						
							| 20 |  | simpr |  | 
						
							| 21 | 4 20 | e2 |  | 
						
							| 22 |  | elsuci |  | 
						
							| 23 | 21 22 | e2 |  | 
						
							| 24 |  | jao |  | 
						
							| 25 | 13 19 23 24 | e222 |  | 
						
							| 26 | 25 | in2 |  | 
						
							| 27 | 26 | gen12 |  | 
						
							| 28 |  | biimpr |  | 
						
							| 29 | 1 27 28 | e01 |  | 
						
							| 30 | 29 | in1 |  |