| Step | Hyp | Ref | Expression | 
						
							| 1 |  | itgadd.1 |  | 
						
							| 2 |  | itgadd.2 |  | 
						
							| 3 |  | itgadd.3 |  | 
						
							| 4 |  | itgadd.4 |  | 
						
							| 5 |  | itgadd.5 |  | 
						
							| 6 |  | itgadd.6 |  | 
						
							| 7 |  | max0sub |  | 
						
							| 8 | 5 7 | syl |  | 
						
							| 9 |  | max0sub |  | 
						
							| 10 | 6 9 | syl |  | 
						
							| 11 | 8 10 | oveq12d |  | 
						
							| 12 |  | 0re |  | 
						
							| 13 |  | ifcl |  | 
						
							| 14 | 5 12 13 | sylancl |  | 
						
							| 15 | 14 | recnd |  | 
						
							| 16 |  | ifcl |  | 
						
							| 17 | 6 12 16 | sylancl |  | 
						
							| 18 | 17 | recnd |  | 
						
							| 19 | 5 | renegcld |  | 
						
							| 20 |  | ifcl |  | 
						
							| 21 | 19 12 20 | sylancl |  | 
						
							| 22 | 21 | recnd |  | 
						
							| 23 | 6 | renegcld |  | 
						
							| 24 |  | ifcl |  | 
						
							| 25 | 23 12 24 | sylancl |  | 
						
							| 26 | 25 | recnd |  | 
						
							| 27 | 15 18 22 26 | addsub4d |  | 
						
							| 28 | 5 6 | readdcld |  | 
						
							| 29 |  | max0sub |  | 
						
							| 30 | 28 29 | syl |  | 
						
							| 31 | 11 27 30 | 3eqtr4rd |  | 
						
							| 32 | 28 | renegcld |  | 
						
							| 33 |  | ifcl |  | 
						
							| 34 | 32 12 33 | sylancl |  | 
						
							| 35 | 34 | recnd |  | 
						
							| 36 | 15 18 | addcld |  | 
						
							| 37 |  | ifcl |  | 
						
							| 38 | 28 12 37 | sylancl |  | 
						
							| 39 | 38 | recnd |  | 
						
							| 40 | 22 26 | addcld |  | 
						
							| 41 | 35 36 39 40 | addsubeq4d |  | 
						
							| 42 | 31 41 | mpbird |  | 
						
							| 43 | 42 | itgeq2dv |  | 
						
							| 44 | 1 2 3 4 | ibladd |  | 
						
							| 45 | 28 | iblre |  | 
						
							| 46 | 44 45 | mpbid |  | 
						
							| 47 | 46 | simprd |  | 
						
							| 48 | 14 17 | readdcld |  | 
						
							| 49 | 5 | iblre |  | 
						
							| 50 | 2 49 | mpbid |  | 
						
							| 51 | 50 | simpld |  | 
						
							| 52 | 6 | iblre |  | 
						
							| 53 | 4 52 | mpbid |  | 
						
							| 54 | 53 | simpld |  | 
						
							| 55 | 14 51 17 54 | ibladd |  | 
						
							| 56 |  | max1 |  | 
						
							| 57 | 12 32 56 | sylancr |  | 
						
							| 58 |  | max1 |  | 
						
							| 59 | 12 5 58 | sylancr |  | 
						
							| 60 |  | max1 |  | 
						
							| 61 | 12 6 60 | sylancr |  | 
						
							| 62 | 14 17 59 61 | addge0d |  | 
						
							| 63 | 34 47 48 55 34 48 57 62 | itgaddlem1 |  | 
						
							| 64 | 46 | simpld |  | 
						
							| 65 | 21 25 | readdcld |  | 
						
							| 66 | 50 | simprd |  | 
						
							| 67 | 53 | simprd |  | 
						
							| 68 | 21 66 25 67 | ibladd |  | 
						
							| 69 |  | max1 |  | 
						
							| 70 | 12 28 69 | sylancr |  | 
						
							| 71 |  | max1 |  | 
						
							| 72 | 12 19 71 | sylancr |  | 
						
							| 73 |  | max1 |  | 
						
							| 74 | 12 23 73 | sylancr |  | 
						
							| 75 | 21 25 72 74 | addge0d |  | 
						
							| 76 | 38 64 65 68 38 65 70 75 | itgaddlem1 |  | 
						
							| 77 | 43 63 76 | 3eqtr3d |  | 
						
							| 78 | 34 47 | itgcl |  | 
						
							| 79 | 14 51 17 54 14 17 59 61 | itgaddlem1 |  | 
						
							| 80 | 14 51 | itgcl |  | 
						
							| 81 | 17 54 | itgcl |  | 
						
							| 82 | 80 81 | addcld |  | 
						
							| 83 | 79 82 | eqeltrd |  | 
						
							| 84 | 38 64 | itgcl |  | 
						
							| 85 | 21 66 25 67 21 25 72 74 | itgaddlem1 |  | 
						
							| 86 | 21 66 | itgcl |  | 
						
							| 87 | 25 67 | itgcl |  | 
						
							| 88 | 86 87 | addcld |  | 
						
							| 89 | 85 88 | eqeltrd |  | 
						
							| 90 | 78 83 84 89 | addsubeq4d |  | 
						
							| 91 | 77 90 | mpbid |  | 
						
							| 92 | 79 85 | oveq12d |  | 
						
							| 93 | 80 81 86 87 | addsub4d |  | 
						
							| 94 | 91 92 93 | 3eqtrd |  | 
						
							| 95 | 28 44 | itgreval |  | 
						
							| 96 | 5 2 | itgreval |  | 
						
							| 97 | 6 4 | itgreval |  | 
						
							| 98 | 96 97 | oveq12d |  | 
						
							| 99 | 94 95 98 | 3eqtr4d |  |