| Step | Hyp | Ref | Expression | 
						
							| 1 |  | evlfcl.e |  | 
						
							| 2 |  | evlfcl.q |  | 
						
							| 3 |  | evlfcl.c |  | 
						
							| 4 |  | evlfcl.d |  | 
						
							| 5 |  | evlfcl.n |  | 
						
							| 6 |  | evlfcl.f |  | 
						
							| 7 |  | evlfcl.g |  | 
						
							| 8 |  | evlfcl.h |  | 
						
							| 9 |  | evlfcl.a |  | 
						
							| 10 |  | evlfcl.b |  | 
						
							| 11 |  | eqid |  | 
						
							| 12 |  | eqid |  | 
						
							| 13 |  | eqid |  | 
						
							| 14 | 6 | simpld |  | 
						
							| 15 | 8 | simpld |  | 
						
							| 16 | 6 | simprd |  | 
						
							| 17 | 8 | simprd |  | 
						
							| 18 |  | eqid |  | 
						
							| 19 |  | eqid |  | 
						
							| 20 | 9 | simpld |  | 
						
							| 21 | 10 | simpld |  | 
						
							| 22 | 2 5 19 20 21 | fuccocl |  | 
						
							| 23 |  | eqid |  | 
						
							| 24 | 7 | simprd |  | 
						
							| 25 | 9 | simprd |  | 
						
							| 26 | 10 | simprd |  | 
						
							| 27 | 11 12 23 3 16 24 17 25 26 | catcocl |  | 
						
							| 28 | 1 3 4 11 12 13 5 14 15 16 17 18 22 27 | evlf2val |  | 
						
							| 29 | 2 5 11 13 19 20 21 17 | fuccoval |  | 
						
							| 30 | 29 | oveq1d |  | 
						
							| 31 |  | relfunc |  | 
						
							| 32 |  | 1st2ndbr |  | 
						
							| 33 | 31 14 32 | sylancr |  | 
						
							| 34 | 11 12 23 13 33 16 24 17 25 26 | funcco |  | 
						
							| 35 | 34 | oveq2d |  | 
						
							| 36 | 5 20 | nat1st2nd |  | 
						
							| 37 | 5 36 11 12 13 24 17 26 | nati |  | 
						
							| 38 | 37 | oveq2d |  | 
						
							| 39 |  | eqid |  | 
						
							| 40 |  | eqid |  | 
						
							| 41 | 11 39 33 | funcf1 |  | 
						
							| 42 | 41 24 | ffvelcdmd |  | 
						
							| 43 | 41 17 | ffvelcdmd |  | 
						
							| 44 | 7 | simpld |  | 
						
							| 45 |  | 1st2ndbr |  | 
						
							| 46 | 31 44 45 | sylancr |  | 
						
							| 47 | 11 39 46 | funcf1 |  | 
						
							| 48 | 47 17 | ffvelcdmd |  | 
						
							| 49 | 11 12 40 33 24 17 | funcf2 |  | 
						
							| 50 | 49 26 | ffvelcdmd |  | 
						
							| 51 | 5 36 11 40 17 | natcl |  | 
						
							| 52 |  | 1st2ndbr |  | 
						
							| 53 | 31 15 52 | sylancr |  | 
						
							| 54 | 11 39 53 | funcf1 |  | 
						
							| 55 | 54 17 | ffvelcdmd |  | 
						
							| 56 | 5 21 | nat1st2nd |  | 
						
							| 57 | 5 56 11 40 17 | natcl |  | 
						
							| 58 | 39 40 13 4 42 43 48 50 51 55 57 | catass |  | 
						
							| 59 | 47 24 | ffvelcdmd |  | 
						
							| 60 | 5 36 11 40 24 | natcl |  | 
						
							| 61 | 11 12 40 46 24 17 | funcf2 |  | 
						
							| 62 | 61 26 | ffvelcdmd |  | 
						
							| 63 | 39 40 13 4 42 59 48 60 62 55 57 | catass |  | 
						
							| 64 | 38 58 63 | 3eqtr4d |  | 
						
							| 65 | 64 | oveq1d |  | 
						
							| 66 | 41 16 | ffvelcdmd |  | 
						
							| 67 | 11 12 40 33 16 24 | funcf2 |  | 
						
							| 68 | 67 25 | ffvelcdmd |  | 
						
							| 69 | 39 40 13 4 43 48 55 51 57 | catcocl |  | 
						
							| 70 | 39 40 13 4 66 42 43 68 50 55 69 | catass |  | 
						
							| 71 | 39 40 13 4 59 48 55 62 57 | catcocl |  | 
						
							| 72 | 39 40 13 4 66 42 59 68 60 55 71 | catass |  | 
						
							| 73 | 65 70 72 | 3eqtr3d |  | 
						
							| 74 | 35 73 | eqtrd |  | 
						
							| 75 | 28 30 74 | 3eqtrd |  | 
						
							| 76 |  | eqid |  | 
						
							| 77 | 2 | fucbas |  | 
						
							| 78 | 2 5 | fuchom |  | 
						
							| 79 |  | eqid |  | 
						
							| 80 | 76 77 11 78 12 14 16 44 24 19 23 79 15 17 20 25 21 26 | xpcco2 |  | 
						
							| 81 | 80 | fveq2d |  | 
						
							| 82 |  | df-ov |  | 
						
							| 83 | 81 82 | eqtr4di |  | 
						
							| 84 |  | df-ov |  | 
						
							| 85 | 1 3 4 11 14 16 | evlf1 |  | 
						
							| 86 | 84 85 | eqtr3id |  | 
						
							| 87 |  | df-ov |  | 
						
							| 88 | 1 3 4 11 44 24 | evlf1 |  | 
						
							| 89 | 87 88 | eqtr3id |  | 
						
							| 90 | 86 89 | opeq12d |  | 
						
							| 91 |  | df-ov |  | 
						
							| 92 | 1 3 4 11 15 17 | evlf1 |  | 
						
							| 93 | 91 92 | eqtr3id |  | 
						
							| 94 | 90 93 | oveq12d |  | 
						
							| 95 |  | df-ov |  | 
						
							| 96 |  | eqid |  | 
						
							| 97 | 1 3 4 11 12 13 5 44 15 24 17 96 21 26 | evlf2val |  | 
						
							| 98 | 95 97 | eqtr3id |  | 
						
							| 99 |  | df-ov |  | 
						
							| 100 |  | eqid |  | 
						
							| 101 | 1 3 4 11 12 13 5 14 44 16 24 100 20 25 | evlf2val |  | 
						
							| 102 | 99 101 | eqtr3id |  | 
						
							| 103 | 94 98 102 | oveq123d |  | 
						
							| 104 | 75 83 103 | 3eqtr4d |  |