| Step | Hyp | Ref | Expression | 
						
							| 1 |  | carsgval.1 |  | 
						
							| 2 |  | carsgval.2 |  | 
						
							| 3 |  | carsgmon.1 |  | 
						
							| 4 |  | carsgmon.2 |  | 
						
							| 5 |  | carsgmon.3 |  | 
						
							| 6 | 4 3 | ssexd |  | 
						
							| 7 |  | id |  | 
						
							| 8 |  | sseq1 |  | 
						
							| 9 | 8 | 3anbi2d |  | 
						
							| 10 |  | fveq2 |  | 
						
							| 11 | 10 | breq1d |  | 
						
							| 12 | 9 11 | imbi12d |  | 
						
							| 13 |  | sseq2 |  | 
						
							| 14 |  | eleq1 |  | 
						
							| 15 | 13 14 | 3anbi23d |  | 
						
							| 16 |  | fveq2 |  | 
						
							| 17 | 16 | breq2d |  | 
						
							| 18 | 15 17 | imbi12d |  | 
						
							| 19 | 12 18 5 | vtocl2g |  | 
						
							| 20 | 19 | imp |  | 
						
							| 21 | 6 4 7 3 4 20 | syl23anc |  |