| Step | Hyp | Ref | Expression | 
						
							| 1 |  | dvaset.h |  | 
						
							| 2 |  | dvaset.t |  | 
						
							| 3 |  | dvaset.e |  | 
						
							| 4 |  | dvaset.d |  | 
						
							| 5 |  | dvaset.u |  | 
						
							| 6 | 1 | dvafset |  | 
						
							| 7 | 6 | fveq1d |  | 
						
							| 8 |  | fveq2 |  | 
						
							| 9 | 8 2 | eqtr4di |  | 
						
							| 10 | 9 | opeq2d |  | 
						
							| 11 |  | eqidd |  | 
						
							| 12 | 9 9 11 | mpoeq123dv |  | 
						
							| 13 | 12 | opeq2d |  | 
						
							| 14 |  | fveq2 |  | 
						
							| 15 | 14 4 | eqtr4di |  | 
						
							| 16 | 15 | opeq2d |  | 
						
							| 17 | 10 13 16 | tpeq123d |  | 
						
							| 18 |  | fveq2 |  | 
						
							| 19 | 18 3 | eqtr4di |  | 
						
							| 20 |  | eqidd |  | 
						
							| 21 | 19 9 20 | mpoeq123dv |  | 
						
							| 22 | 21 | opeq2d |  | 
						
							| 23 | 22 | sneqd |  | 
						
							| 24 | 17 23 | uneq12d |  | 
						
							| 25 |  | eqid |  | 
						
							| 26 |  | tpex |  | 
						
							| 27 |  | snex |  | 
						
							| 28 | 26 27 | unex |  | 
						
							| 29 | 24 25 28 | fvmpt |  | 
						
							| 30 | 7 29 | sylan9eq |  | 
						
							| 31 | 5 30 | eqtrid |  |