| Step | Hyp | Ref | Expression | 
						
							| 1 |  | lvolnlelpln.l |  | 
						
							| 2 |  | lvolnlelpln.p |  | 
						
							| 3 |  | lvolnlelpln.v |  | 
						
							| 4 |  | simp3 |  | 
						
							| 5 |  | eqid |  | 
						
							| 6 |  | eqid |  | 
						
							| 7 |  | eqid |  | 
						
							| 8 | 5 1 6 7 2 | islpln2 |  | 
						
							| 9 | 8 | 3ad2ant1 |  | 
						
							| 10 | 4 9 | mpbid |  | 
						
							| 11 |  | simp1l1 |  | 
						
							| 12 |  | simp1l2 |  | 
						
							| 13 |  | simp1r |  | 
						
							| 14 |  | simp2l |  | 
						
							| 15 |  | simp2r |  | 
						
							| 16 | 1 6 7 3 | lvolnle3at |  | 
						
							| 17 | 11 12 13 14 15 16 | syl23anc |  | 
						
							| 18 |  | simp33 |  | 
						
							| 19 | 18 | breq2d |  | 
						
							| 20 | 17 19 | mtbird |  | 
						
							| 21 | 20 | 3exp |  | 
						
							| 22 | 21 | rexlimdvv |  | 
						
							| 23 | 22 | rexlimdva |  | 
						
							| 24 | 23 | adantld |  | 
						
							| 25 | 10 24 | mpd |  |