| Step | Hyp | Ref | Expression | 
						
							| 1 |  | isthincd2lem2.1 |  | 
						
							| 2 |  | isthincd2lem2.2 |  | 
						
							| 3 |  | isthincd2lem2.3 |  | 
						
							| 4 |  | isthincd2lem2.4 |  | 
						
							| 5 |  | isthincd2lem2.5 |  | 
						
							| 6 |  | isthincd2lem2.6 |  | 
						
							| 7 |  | oveq1 |  | 
						
							| 8 |  | opeq1 |  | 
						
							| 9 | 8 | oveq1d |  | 
						
							| 10 | 9 | oveqd |  | 
						
							| 11 |  | oveq1 |  | 
						
							| 12 | 10 11 | eleq12d |  | 
						
							| 13 | 12 | ralbidv |  | 
						
							| 14 | 7 13 | raleqbidv |  | 
						
							| 15 |  | oveq2 |  | 
						
							| 16 |  | oveq1 |  | 
						
							| 17 |  | opeq2 |  | 
						
							| 18 | 17 | oveq1d |  | 
						
							| 19 | 18 | oveqd |  | 
						
							| 20 | 19 | eleq1d |  | 
						
							| 21 | 16 20 | raleqbidv |  | 
						
							| 22 | 15 21 | raleqbidv |  | 
						
							| 23 |  | oveq2 |  | 
						
							| 24 |  | oveq2 |  | 
						
							| 25 | 24 | oveqd |  | 
						
							| 26 |  | oveq2 |  | 
						
							| 27 | 25 26 | eleq12d |  | 
						
							| 28 | 23 27 | raleqbidv |  | 
						
							| 29 | 28 | ralbidv |  | 
						
							| 30 |  | oveq2 |  | 
						
							| 31 | 30 | eleq1d |  | 
						
							| 32 |  | oveq1 |  | 
						
							| 33 | 32 | eleq1d |  | 
						
							| 34 | 31 33 | cbvral2vw |  | 
						
							| 35 | 29 34 | bitrdi |  | 
						
							| 36 | 14 22 35 | cbvral3vw |  | 
						
							| 37 | 6 36 | sylib |  | 
						
							| 38 |  | oveq1 |  | 
						
							| 39 |  | opeq1 |  | 
						
							| 40 | 39 | oveq1d |  | 
						
							| 41 | 40 | oveqd |  | 
						
							| 42 |  | oveq1 |  | 
						
							| 43 | 41 42 | eleq12d |  | 
						
							| 44 | 43 | ralbidv |  | 
						
							| 45 | 38 44 | raleqbidv |  | 
						
							| 46 |  | oveq2 |  | 
						
							| 47 |  | oveq1 |  | 
						
							| 48 |  | opeq2 |  | 
						
							| 49 | 48 | oveq1d |  | 
						
							| 50 | 49 | oveqd |  | 
						
							| 51 | 50 | eleq1d |  | 
						
							| 52 | 47 51 | raleqbidv |  | 
						
							| 53 | 46 52 | raleqbidv |  | 
						
							| 54 |  | oveq2 |  | 
						
							| 55 |  | oveq2 |  | 
						
							| 56 | 55 | oveqd |  | 
						
							| 57 |  | oveq2 |  | 
						
							| 58 | 56 57 | eleq12d |  | 
						
							| 59 | 54 58 | raleqbidv |  | 
						
							| 60 | 59 | ralbidv |  | 
						
							| 61 | 45 53 60 | rspc3v |  | 
						
							| 62 | 1 2 3 61 | syl3anc |  | 
						
							| 63 | 37 62 | mpd |  | 
						
							| 64 |  | oveq2 |  | 
						
							| 65 | 64 | eleq1d |  | 
						
							| 66 |  | oveq1 |  | 
						
							| 67 | 66 | eleq1d |  | 
						
							| 68 | 65 67 | rspc2v |  | 
						
							| 69 | 4 5 68 | syl2anc |  | 
						
							| 70 | 63 69 | mpd |  |