| Step | Hyp | Ref | Expression | 
						
							| 1 |  | 2re |  | 
						
							| 2 |  | 1nn |  | 
						
							| 3 |  | 3nn0 |  | 
						
							| 4 |  | 2nn0 |  | 
						
							| 5 |  | 2lt10 |  | 
						
							| 6 | 2 3 4 5 | declti |  | 
						
							| 7 | 1 6 | ltneii |  | 
						
							| 8 |  | plusgndx |  | 
						
							| 9 |  | unifndx |  | 
						
							| 10 | 8 9 | neeq12i |  | 
						
							| 11 | 7 10 | mpbir |  | 
						
							| 12 |  | 3re |  | 
						
							| 13 |  | 3lt10 |  | 
						
							| 14 | 2 3 3 13 | declti |  | 
						
							| 15 | 12 14 | ltneii |  | 
						
							| 16 |  | mulrndx |  | 
						
							| 17 | 16 9 | neeq12i |  | 
						
							| 18 | 15 17 | mpbir |  | 
						
							| 19 |  | 4re |  | 
						
							| 20 |  | 4nn0 |  | 
						
							| 21 |  | 4lt10 |  | 
						
							| 22 | 2 3 20 21 | declti |  | 
						
							| 23 | 19 22 | ltneii |  | 
						
							| 24 |  | starvndx |  | 
						
							| 25 | 24 9 | neeq12i |  | 
						
							| 26 | 23 25 | mpbir |  | 
						
							| 27 | 11 18 26 | 3pm3.2i |  | 
						
							| 28 |  | 10re |  | 
						
							| 29 |  | 1nn0 |  | 
						
							| 30 |  | 0nn0 |  | 
						
							| 31 |  | 3nn |  | 
						
							| 32 |  | 3pos |  | 
						
							| 33 | 29 30 31 32 | declt |  | 
						
							| 34 | 28 33 | ltneii |  | 
						
							| 35 |  | plendx |  | 
						
							| 36 | 35 9 | neeq12i |  | 
						
							| 37 | 34 36 | mpbir |  | 
						
							| 38 |  | 2nn |  | 
						
							| 39 | 29 38 | decnncl |  | 
						
							| 40 | 39 | nnrei |  | 
						
							| 41 |  | 2lt3 |  | 
						
							| 42 | 29 4 31 41 | declt |  | 
						
							| 43 | 40 42 | ltneii |  | 
						
							| 44 |  | dsndx |  | 
						
							| 45 | 44 9 | neeq12i |  | 
						
							| 46 | 43 45 | mpbir |  | 
						
							| 47 | 37 46 | pm3.2i |  | 
						
							| 48 | 27 47 | pm3.2i |  |