| Step | Hyp | Ref | Expression | 
						
							| 1 |  | islmod.v |  | 
						
							| 2 |  | islmod.a |  | 
						
							| 3 |  | islmod.s |  | 
						
							| 4 |  | islmod.f |  | 
						
							| 5 |  | islmod.k |  | 
						
							| 6 |  | islmod.p |  | 
						
							| 7 |  | islmod.t |  | 
						
							| 8 |  | islmod.u |  | 
						
							| 9 |  | fveq2 |  | 
						
							| 10 | 9 1 | eqtr4di |  | 
						
							| 11 |  | fveq2 |  | 
						
							| 12 | 11 2 | eqtr4di |  | 
						
							| 13 |  | fveq2 |  | 
						
							| 14 | 13 4 | eqtr4di |  | 
						
							| 15 |  | fveq2 |  | 
						
							| 16 | 15 3 | eqtr4di |  | 
						
							| 17 | 16 | sbceq1d |  | 
						
							| 18 | 14 17 | sbceqbid |  | 
						
							| 19 | 12 18 | sbceqbid |  | 
						
							| 20 | 10 19 | sbceqbid |  | 
						
							| 21 | 1 | fvexi |  | 
						
							| 22 | 2 | fvexi |  | 
						
							| 23 | 4 | fvexi |  | 
						
							| 24 |  | simp3 |  | 
						
							| 25 | 24 | fveq2d |  | 
						
							| 26 | 25 5 | eqtr4di |  | 
						
							| 27 | 24 | fveq2d |  | 
						
							| 28 | 27 6 | eqtr4di |  | 
						
							| 29 | 24 | fveq2d |  | 
						
							| 30 | 29 7 | eqtr4di |  | 
						
							| 31 | 30 | sbceq1d |  | 
						
							| 32 | 7 | fvexi |  | 
						
							| 33 |  | oveq |  | 
						
							| 34 | 33 | oveq1d |  | 
						
							| 35 | 34 | eqeq1d |  | 
						
							| 36 | 35 | anbi1d |  | 
						
							| 37 | 36 | anbi2d |  | 
						
							| 38 | 37 | 2ralbidv |  | 
						
							| 39 | 38 | 2ralbidv |  | 
						
							| 40 | 39 | anbi2d |  | 
						
							| 41 | 32 40 | sbcie |  | 
						
							| 42 | 24 | eleq1d |  | 
						
							| 43 |  | simp1 |  | 
						
							| 44 | 43 | eleq2d |  | 
						
							| 45 |  | simp2 |  | 
						
							| 46 | 45 | oveqd |  | 
						
							| 47 | 46 | oveq2d |  | 
						
							| 48 | 45 | oveqd |  | 
						
							| 49 | 47 48 | eqeq12d |  | 
						
							| 50 | 45 | oveqd |  | 
						
							| 51 | 50 | eqeq2d |  | 
						
							| 52 | 44 49 51 | 3anbi123d |  | 
						
							| 53 | 24 | fveq2d |  | 
						
							| 54 | 53 8 | eqtr4di |  | 
						
							| 55 | 54 | oveq1d |  | 
						
							| 56 | 55 | eqeq1d |  | 
						
							| 57 | 56 | anbi2d |  | 
						
							| 58 | 52 57 | anbi12d |  | 
						
							| 59 | 43 58 | raleqbidv |  | 
						
							| 60 | 43 59 | raleqbidv |  | 
						
							| 61 | 60 | 2ralbidv |  | 
						
							| 62 | 42 61 | anbi12d |  | 
						
							| 63 | 41 62 | bitrid |  | 
						
							| 64 | 31 63 | bitrd |  | 
						
							| 65 | 28 64 | sbceqbid |  | 
						
							| 66 | 26 65 | sbceqbid |  | 
						
							| 67 | 66 | sbcbidv |  | 
						
							| 68 | 21 22 23 67 | sbc3ie |  | 
						
							| 69 | 3 | fvexi |  | 
						
							| 70 | 5 | fvexi |  | 
						
							| 71 | 6 | fvexi |  | 
						
							| 72 |  | simp2 |  | 
						
							| 73 |  | simp1 |  | 
						
							| 74 | 73 | oveqd |  | 
						
							| 75 | 74 | eleq1d |  | 
						
							| 76 | 73 | oveqd |  | 
						
							| 77 | 73 | oveqd |  | 
						
							| 78 | 74 77 | oveq12d |  | 
						
							| 79 | 76 78 | eqeq12d |  | 
						
							| 80 |  | simp3 |  | 
						
							| 81 | 80 | oveqd |  | 
						
							| 82 | 81 | oveq1d |  | 
						
							| 83 | 73 | oveqd |  | 
						
							| 84 | 82 83 | eqtrd |  | 
						
							| 85 | 73 | oveqd |  | 
						
							| 86 | 85 74 | oveq12d |  | 
						
							| 87 | 84 86 | eqeq12d |  | 
						
							| 88 | 75 79 87 | 3anbi123d |  | 
						
							| 89 | 73 | oveqd |  | 
						
							| 90 | 74 | oveq2d |  | 
						
							| 91 | 73 | oveqd |  | 
						
							| 92 | 90 91 | eqtrd |  | 
						
							| 93 | 89 92 | eqeq12d |  | 
						
							| 94 | 73 | oveqd |  | 
						
							| 95 | 94 | eqeq1d |  | 
						
							| 96 | 93 95 | anbi12d |  | 
						
							| 97 | 88 96 | anbi12d |  | 
						
							| 98 | 97 | 2ralbidv |  | 
						
							| 99 | 72 98 | raleqbidv |  | 
						
							| 100 | 72 99 | raleqbidv |  | 
						
							| 101 | 100 | anbi2d |  | 
						
							| 102 | 69 70 71 101 | sbc3ie |  | 
						
							| 103 | 68 102 | bitri |  | 
						
							| 104 | 20 103 | bitrdi |  | 
						
							| 105 |  | df-lmod |  | 
						
							| 106 | 104 105 | elrab2 |  | 
						
							| 107 |  | 3anass |  | 
						
							| 108 | 106 107 | bitr4i |  |