| Step | Hyp | Ref | Expression | 
						
							| 1 |  | abl4pnp.1 |  | 
						
							| 2 |  | abl4pnp.2 |  | 
						
							| 3 |  | df-3an |  | 
						
							| 4 | 1 2 | ablomuldiv |  | 
						
							| 5 | 3 4 | sylan2br |  | 
						
							| 6 | 5 | adantrrr |  | 
						
							| 7 | 6 | oveq1d |  | 
						
							| 8 |  | ablogrpo |  | 
						
							| 9 | 1 | grpocl |  | 
						
							| 10 | 9 | 3expib |  | 
						
							| 11 | 8 10 | syl |  | 
						
							| 12 | 11 | anim1d |  | 
						
							| 13 |  | 3anass |  | 
						
							| 14 | 12 13 | imbitrrdi |  | 
						
							| 15 | 14 | imp |  | 
						
							| 16 | 1 2 | ablodivdiv4 |  | 
						
							| 17 | 15 16 | syldan |  | 
						
							| 18 | 1 2 | grpodivcl |  | 
						
							| 19 | 18 | 3expib |  | 
						
							| 20 | 19 | anim1d |  | 
						
							| 21 |  | an4 |  | 
						
							| 22 |  | 3anass |  | 
						
							| 23 | 20 21 22 | 3imtr4g |  | 
						
							| 24 | 23 | imp |  | 
						
							| 25 | 1 2 | grpomuldivass |  | 
						
							| 26 | 24 25 | syldan |  | 
						
							| 27 | 8 26 | sylan |  | 
						
							| 28 | 7 17 27 | 3eqtr3d |  |