| Step | Hyp | Ref | Expression | 
						
							| 1 |  | dvhfvadd.h |  | 
						
							| 2 |  | dvhfvadd.t |  | 
						
							| 3 |  | dvhfvadd.e |  | 
						
							| 4 |  | dvhfvadd.u |  | 
						
							| 5 |  | dvhfvadd.f |  | 
						
							| 6 |  | dvhfvadd.p |  | 
						
							| 7 |  | dvhfvadd.a |  | 
						
							| 8 |  | dvhfvadd.s |  | 
						
							| 9 |  | eqid |  | 
						
							| 10 | 1 2 3 9 4 | dvhset |  | 
						
							| 11 | 10 | fveq2d |  | 
						
							| 12 | 1 9 4 5 | dvhsca |  | 
						
							| 13 | 12 | fveq2d |  | 
						
							| 14 | 6 13 | eqtrid |  | 
						
							| 15 | 14 | oveqd |  | 
						
							| 16 | 15 | 3ad2ant1 |  | 
						
							| 17 |  | xp2nd |  | 
						
							| 18 |  | xp2nd |  | 
						
							| 19 | 17 18 | anim12i |  | 
						
							| 20 |  | eqid |  | 
						
							| 21 | 1 2 3 9 20 | erngplus |  | 
						
							| 22 | 19 21 | sylan2 |  | 
						
							| 23 | 22 | 3impb |  | 
						
							| 24 | 16 23 | eqtrd |  | 
						
							| 25 | 24 | opeq2d |  | 
						
							| 26 | 25 | mpoeq3dva |  | 
						
							| 27 | 2 | fvexi |  | 
						
							| 28 | 3 | fvexi |  | 
						
							| 29 | 27 28 | xpex |  | 
						
							| 30 | 29 29 | mpoex |  | 
						
							| 31 |  | eqid |  | 
						
							| 32 | 31 | lmodplusg |  | 
						
							| 33 | 30 32 | ax-mp |  | 
						
							| 34 | 26 33 | eqtr2di |  | 
						
							| 35 | 11 34 | eqtrd |  | 
						
							| 36 | 35 8 7 | 3eqtr4g |  |