| Step | Hyp | Ref | Expression | 
						
							| 1 |  | lauteq.b |  | 
						
							| 2 |  | lauteq.a |  | 
						
							| 3 |  | lauteq.i |  | 
						
							| 4 |  | simpl1 |  | 
						
							| 5 |  | simpl2 |  | 
						
							| 6 | 1 2 | atbase |  | 
						
							| 7 | 6 | adantl |  | 
						
							| 8 |  | simpl3 |  | 
						
							| 9 |  | eqid |  | 
						
							| 10 | 1 9 3 | lautle |  | 
						
							| 11 | 4 5 7 8 10 | syl22anc |  | 
						
							| 12 |  | breq1 |  | 
						
							| 13 | 11 12 | sylan9bb |  | 
						
							| 14 | 13 | bicomd |  | 
						
							| 15 | 14 | ex |  | 
						
							| 16 | 15 | ralimdva |  | 
						
							| 17 | 16 | imp |  | 
						
							| 18 |  | simpl1 |  | 
						
							| 19 |  | simpl2 |  | 
						
							| 20 |  | simpl3 |  | 
						
							| 21 | 1 3 | lautcl |  | 
						
							| 22 | 18 19 20 21 | syl21anc |  | 
						
							| 23 | 1 9 2 | hlateq |  | 
						
							| 24 | 18 22 20 23 | syl3anc |  | 
						
							| 25 | 17 24 | mpbid |  |