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Description: Lemma for rplogsum . (Contributed by Mario Carneiro, 2-May-2016)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | rplogsumlem1 | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( log ` n ) / ( n x. ( n - 1 ) ) ) <_ 2 ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fzfid | |- ( A e. NN -> ( 2 ... A ) e. Fin ) |
|
| 2 | elfzuz | |- ( n e. ( 2 ... A ) -> n e. ( ZZ>= ` 2 ) ) |
|
| 3 | eluz2nn | |- ( n e. ( ZZ>= ` 2 ) -> n e. NN ) |
|
| 4 | 2 3 | syl | |- ( n e. ( 2 ... A ) -> n e. NN ) |
| 5 | 4 | adantl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> n e. NN ) |
| 6 | 5 | nnrpd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> n e. RR+ ) |
| 7 | 6 | relogcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( log ` n ) e. RR ) |
| 8 | 2 | adantl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> n e. ( ZZ>= ` 2 ) ) |
| 9 | uz2m1nn | |- ( n e. ( ZZ>= ` 2 ) -> ( n - 1 ) e. NN ) |
|
| 10 | 8 9 | syl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n - 1 ) e. NN ) |
| 11 | 5 10 | nnmulcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n x. ( n - 1 ) ) e. NN ) |
| 12 | 7 11 | nndivred | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( log ` n ) / ( n x. ( n - 1 ) ) ) e. RR ) |
| 13 | 1 12 | fsumrecl | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( log ` n ) / ( n x. ( n - 1 ) ) ) e. RR ) |
| 14 | 2re | |- 2 e. RR |
|
| 15 | 10 | nnrpd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n - 1 ) e. RR+ ) |
| 16 | 15 | rpsqrtcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( n - 1 ) ) e. RR+ ) |
| 17 | rerpdivcl | |- ( ( 2 e. RR /\ ( sqrt ` ( n - 1 ) ) e. RR+ ) -> ( 2 / ( sqrt ` ( n - 1 ) ) ) e. RR ) |
|
| 18 | 14 16 17 | sylancr | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 2 / ( sqrt ` ( n - 1 ) ) ) e. RR ) |
| 19 | 6 | rpsqrtcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` n ) e. RR+ ) |
| 20 | rerpdivcl | |- ( ( 2 e. RR /\ ( sqrt ` n ) e. RR+ ) -> ( 2 / ( sqrt ` n ) ) e. RR ) |
|
| 21 | 14 19 20 | sylancr | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 2 / ( sqrt ` n ) ) e. RR ) |
| 22 | 18 21 | resubcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) e. RR ) |
| 23 | 1 22 | fsumrecl | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) e. RR ) |
| 24 | 14 | a1i | |- ( A e. NN -> 2 e. RR ) |
| 25 | 16 | rpred | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( n - 1 ) ) e. RR ) |
| 26 | 5 | nnred | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> n e. RR ) |
| 27 | peano2rem | |- ( n e. RR -> ( n - 1 ) e. RR ) |
|
| 28 | 26 27 | syl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n - 1 ) e. RR ) |
| 29 | 26 28 | remulcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n x. ( n - 1 ) ) e. RR ) |
| 30 | 29 22 | remulcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) e. RR ) |
| 31 | 5 | nncnd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> n e. CC ) |
| 32 | ax-1cn | |- 1 e. CC |
|
| 33 | npcan | |- ( ( n e. CC /\ 1 e. CC ) -> ( ( n - 1 ) + 1 ) = n ) |
|
| 34 | 31 32 33 | sylancl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( n - 1 ) + 1 ) = n ) |
| 35 | 34 | fveq2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( log ` ( ( n - 1 ) + 1 ) ) = ( log ` n ) ) |
| 36 | 15 | rpge0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 0 <_ ( n - 1 ) ) |
| 37 | loglesqrt | |- ( ( ( n - 1 ) e. RR /\ 0 <_ ( n - 1 ) ) -> ( log ` ( ( n - 1 ) + 1 ) ) <_ ( sqrt ` ( n - 1 ) ) ) |
|
| 38 | 28 36 37 | syl2anc | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( log ` ( ( n - 1 ) + 1 ) ) <_ ( sqrt ` ( n - 1 ) ) ) |
| 39 | 35 38 | eqbrtrrd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( log ` n ) <_ ( sqrt ` ( n - 1 ) ) ) |
| 40 | 19 | rpred | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` n ) e. RR ) |
| 41 | 40 25 | readdcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) e. RR ) |
| 42 | remulcl | |- ( ( ( sqrt ` n ) e. RR /\ 2 e. RR ) -> ( ( sqrt ` n ) x. 2 ) e. RR ) |
|
| 43 | 40 14 42 | sylancl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. 2 ) e. RR ) |
| 44 | 40 25 | resubcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) e. RR ) |
| 45 | 26 | lem1d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n - 1 ) <_ n ) |
| 46 | 6 | rpge0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 0 <_ n ) |
| 47 | 28 36 26 46 | sqrtled | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( n - 1 ) <_ n <-> ( sqrt ` ( n - 1 ) ) <_ ( sqrt ` n ) ) ) |
| 48 | 45 47 | mpbid | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( n - 1 ) ) <_ ( sqrt ` n ) ) |
| 49 | 40 25 | subge0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 0 <_ ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) <-> ( sqrt ` ( n - 1 ) ) <_ ( sqrt ` n ) ) ) |
| 50 | 48 49 | mpbird | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 0 <_ ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) |
| 51 | 25 40 40 48 | leadd2dd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) <_ ( ( sqrt ` n ) + ( sqrt ` n ) ) ) |
| 52 | 19 | rpcnd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` n ) e. CC ) |
| 53 | 52 | times2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. 2 ) = ( ( sqrt ` n ) + ( sqrt ` n ) ) ) |
| 54 | 51 53 | breqtrrd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) <_ ( ( sqrt ` n ) x. 2 ) ) |
| 55 | 41 43 44 50 54 | lemul1ad | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) <_ ( ( ( sqrt ` n ) x. 2 ) x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) |
| 56 | 31 | sqsqrtd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) ^ 2 ) = n ) |
| 57 | subcl | |- ( ( n e. CC /\ 1 e. CC ) -> ( n - 1 ) e. CC ) |
|
| 58 | 31 32 57 | sylancl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n - 1 ) e. CC ) |
| 59 | 58 | sqsqrtd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` ( n - 1 ) ) ^ 2 ) = ( n - 1 ) ) |
| 60 | 56 59 | oveq12d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) ^ 2 ) - ( ( sqrt ` ( n - 1 ) ) ^ 2 ) ) = ( n - ( n - 1 ) ) ) |
| 61 | 16 | rpcnd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( n - 1 ) ) e. CC ) |
| 62 | subsq | |- ( ( ( sqrt ` n ) e. CC /\ ( sqrt ` ( n - 1 ) ) e. CC ) -> ( ( ( sqrt ` n ) ^ 2 ) - ( ( sqrt ` ( n - 1 ) ) ^ 2 ) ) = ( ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) |
|
| 63 | 52 61 62 | syl2anc | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) ^ 2 ) - ( ( sqrt ` ( n - 1 ) ) ^ 2 ) ) = ( ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) |
| 64 | nncan | |- ( ( n e. CC /\ 1 e. CC ) -> ( n - ( n - 1 ) ) = 1 ) |
|
| 65 | 31 32 64 | sylancl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n - ( n - 1 ) ) = 1 ) |
| 66 | 60 63 65 | 3eqtr3d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) + ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) = 1 ) |
| 67 | 2cn | |- 2 e. CC |
|
| 68 | 67 | a1i | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 2 e. CC ) |
| 69 | 44 | recnd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) e. CC ) |
| 70 | 52 68 69 | mulassd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) x. 2 ) x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) = ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 71 | 55 66 70 | 3brtr3d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 1 <_ ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 72 | 1red | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 1 e. RR ) |
|
| 73 | remulcl | |- ( ( 2 e. RR /\ ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) e. RR ) -> ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) e. RR ) |
|
| 74 | 14 44 73 | sylancr | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) e. RR ) |
| 75 | 40 74 | remulcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) e. RR ) |
| 76 | 72 75 16 | lemul1d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 1 <_ ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) <-> ( 1 x. ( sqrt ` ( n - 1 ) ) ) <_ ( ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) x. ( sqrt ` ( n - 1 ) ) ) ) ) |
| 77 | 71 76 | mpbid | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 1 x. ( sqrt ` ( n - 1 ) ) ) <_ ( ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) x. ( sqrt ` ( n - 1 ) ) ) ) |
| 78 | 61 | mullidd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 1 x. ( sqrt ` ( n - 1 ) ) ) = ( sqrt ` ( n - 1 ) ) ) |
| 79 | 74 | recnd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) e. CC ) |
| 80 | 52 79 61 | mul32d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) x. ( sqrt ` ( n - 1 ) ) ) = ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 81 | 77 78 80 | 3brtr3d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( n - 1 ) ) <_ ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 82 | remsqsqrt | |- ( ( n e. RR /\ 0 <_ n ) -> ( ( sqrt ` n ) x. ( sqrt ` n ) ) = n ) |
|
| 83 | 26 46 82 | syl2anc | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. ( sqrt ` n ) ) = n ) |
| 84 | remsqsqrt | |- ( ( ( n - 1 ) e. RR /\ 0 <_ ( n - 1 ) ) -> ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` ( n - 1 ) ) ) = ( n - 1 ) ) |
|
| 85 | 28 36 84 | syl2anc | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` ( n - 1 ) ) ) = ( n - 1 ) ) |
| 86 | 83 85 | oveq12d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) x. ( sqrt ` n ) ) x. ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` ( n - 1 ) ) ) ) = ( n x. ( n - 1 ) ) ) |
| 87 | 52 52 61 61 | mul4d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) x. ( sqrt ` n ) ) x. ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` ( n - 1 ) ) ) ) = ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) |
| 88 | 86 87 | eqtr3d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( n x. ( n - 1 ) ) = ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) |
| 89 | 16 | rpcnne0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` ( n - 1 ) ) e. CC /\ ( sqrt ` ( n - 1 ) ) =/= 0 ) ) |
| 90 | 19 | rpcnne0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) e. CC /\ ( sqrt ` n ) =/= 0 ) ) |
| 91 | divsubdiv | |- ( ( ( 2 e. CC /\ 2 e. CC ) /\ ( ( ( sqrt ` ( n - 1 ) ) e. CC /\ ( sqrt ` ( n - 1 ) ) =/= 0 ) /\ ( ( sqrt ` n ) e. CC /\ ( sqrt ` n ) =/= 0 ) ) ) -> ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) = ( ( ( 2 x. ( sqrt ` n ) ) - ( 2 x. ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` n ) ) ) ) |
|
| 92 | 68 68 89 90 91 | syl22anc | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) = ( ( ( 2 x. ( sqrt ` n ) ) - ( 2 x. ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` n ) ) ) ) |
| 93 | 68 52 61 | subdid | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) = ( ( 2 x. ( sqrt ` n ) ) - ( 2 x. ( sqrt ` ( n - 1 ) ) ) ) ) |
| 94 | 52 61 | mulcomd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) = ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` n ) ) ) |
| 95 | 93 94 | oveq12d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) = ( ( ( 2 x. ( sqrt ` n ) ) - ( 2 x. ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` ( n - 1 ) ) x. ( sqrt ` n ) ) ) ) |
| 96 | 92 95 | eqtr4d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) = ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) |
| 97 | 88 96 | oveq12d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) = ( ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) x. ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 98 | 52 61 | mulcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) e. CC ) |
| 99 | 19 16 | rpmulcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) e. RR+ ) |
| 100 | 74 99 | rerpdivcld | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) e. RR ) |
| 101 | 100 | recnd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) e. CC ) |
| 102 | 98 98 101 | mulassd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) x. ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) = ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) ) ) |
| 103 | 99 | rpne0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) =/= 0 ) |
| 104 | 79 98 103 | divcan2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) = ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) |
| 105 | 104 | oveq2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) / ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) ) ) ) = ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 106 | 97 102 105 | 3eqtrd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) = ( ( ( sqrt ` n ) x. ( sqrt ` ( n - 1 ) ) ) x. ( 2 x. ( ( sqrt ` n ) - ( sqrt ` ( n - 1 ) ) ) ) ) ) |
| 107 | 81 106 | breqtrrd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( n - 1 ) ) <_ ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) ) |
| 108 | 7 25 30 39 107 | letrd | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( log ` n ) <_ ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) ) |
| 109 | 11 | nngt0d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> 0 < ( n x. ( n - 1 ) ) ) |
| 110 | ledivmul | |- ( ( ( log ` n ) e. RR /\ ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) e. RR /\ ( ( n x. ( n - 1 ) ) e. RR /\ 0 < ( n x. ( n - 1 ) ) ) ) -> ( ( ( log ` n ) / ( n x. ( n - 1 ) ) ) <_ ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) <-> ( log ` n ) <_ ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) ) ) |
|
| 111 | 7 22 29 109 110 | syl112anc | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( ( log ` n ) / ( n x. ( n - 1 ) ) ) <_ ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) <-> ( log ` n ) <_ ( ( n x. ( n - 1 ) ) x. ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) ) ) |
| 112 | 108 111 | mpbird | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( log ` n ) / ( n x. ( n - 1 ) ) ) <_ ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) |
| 113 | 1 12 22 112 | fsumle | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( log ` n ) / ( n x. ( n - 1 ) ) ) <_ sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) |
| 114 | fvoveq1 | |- ( k = n -> ( sqrt ` ( k - 1 ) ) = ( sqrt ` ( n - 1 ) ) ) |
|
| 115 | 114 | oveq2d | |- ( k = n -> ( 2 / ( sqrt ` ( k - 1 ) ) ) = ( 2 / ( sqrt ` ( n - 1 ) ) ) ) |
| 116 | fvoveq1 | |- ( k = ( n + 1 ) -> ( sqrt ` ( k - 1 ) ) = ( sqrt ` ( ( n + 1 ) - 1 ) ) ) |
|
| 117 | 116 | oveq2d | |- ( k = ( n + 1 ) -> ( 2 / ( sqrt ` ( k - 1 ) ) ) = ( 2 / ( sqrt ` ( ( n + 1 ) - 1 ) ) ) ) |
| 118 | oveq1 | |- ( k = 2 -> ( k - 1 ) = ( 2 - 1 ) ) |
|
| 119 | 2m1e1 | |- ( 2 - 1 ) = 1 |
|
| 120 | 118 119 | eqtrdi | |- ( k = 2 -> ( k - 1 ) = 1 ) |
| 121 | 120 | fveq2d | |- ( k = 2 -> ( sqrt ` ( k - 1 ) ) = ( sqrt ` 1 ) ) |
| 122 | sqrt1 | |- ( sqrt ` 1 ) = 1 |
|
| 123 | 121 122 | eqtrdi | |- ( k = 2 -> ( sqrt ` ( k - 1 ) ) = 1 ) |
| 124 | 123 | oveq2d | |- ( k = 2 -> ( 2 / ( sqrt ` ( k - 1 ) ) ) = ( 2 / 1 ) ) |
| 125 | 67 | div1i | |- ( 2 / 1 ) = 2 |
| 126 | 124 125 | eqtrdi | |- ( k = 2 -> ( 2 / ( sqrt ` ( k - 1 ) ) ) = 2 ) |
| 127 | fvoveq1 | |- ( k = ( A + 1 ) -> ( sqrt ` ( k - 1 ) ) = ( sqrt ` ( ( A + 1 ) - 1 ) ) ) |
|
| 128 | 127 | oveq2d | |- ( k = ( A + 1 ) -> ( 2 / ( sqrt ` ( k - 1 ) ) ) = ( 2 / ( sqrt ` ( ( A + 1 ) - 1 ) ) ) ) |
| 129 | nnz | |- ( A e. NN -> A e. ZZ ) |
|
| 130 | eluzp1p1 | |- ( A e. ( ZZ>= ` 1 ) -> ( A + 1 ) e. ( ZZ>= ` ( 1 + 1 ) ) ) |
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| 131 | nnuz | |- NN = ( ZZ>= ` 1 ) |
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| 132 | 130 131 | eleq2s | |- ( A e. NN -> ( A + 1 ) e. ( ZZ>= ` ( 1 + 1 ) ) ) |
| 133 | df-2 | |- 2 = ( 1 + 1 ) |
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| 134 | 133 | fveq2i | |- ( ZZ>= ` 2 ) = ( ZZ>= ` ( 1 + 1 ) ) |
| 135 | 132 134 | eleqtrrdi | |- ( A e. NN -> ( A + 1 ) e. ( ZZ>= ` 2 ) ) |
| 136 | elfzuz | |- ( k e. ( 2 ... ( A + 1 ) ) -> k e. ( ZZ>= ` 2 ) ) |
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| 137 | uz2m1nn | |- ( k e. ( ZZ>= ` 2 ) -> ( k - 1 ) e. NN ) |
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| 138 | 136 137 | syl | |- ( k e. ( 2 ... ( A + 1 ) ) -> ( k - 1 ) e. NN ) |
| 139 | 138 | adantl | |- ( ( A e. NN /\ k e. ( 2 ... ( A + 1 ) ) ) -> ( k - 1 ) e. NN ) |
| 140 | 139 | nnrpd | |- ( ( A e. NN /\ k e. ( 2 ... ( A + 1 ) ) ) -> ( k - 1 ) e. RR+ ) |
| 141 | 140 | rpsqrtcld | |- ( ( A e. NN /\ k e. ( 2 ... ( A + 1 ) ) ) -> ( sqrt ` ( k - 1 ) ) e. RR+ ) |
| 142 | rerpdivcl | |- ( ( 2 e. RR /\ ( sqrt ` ( k - 1 ) ) e. RR+ ) -> ( 2 / ( sqrt ` ( k - 1 ) ) ) e. RR ) |
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| 143 | 14 141 142 | sylancr | |- ( ( A e. NN /\ k e. ( 2 ... ( A + 1 ) ) ) -> ( 2 / ( sqrt ` ( k - 1 ) ) ) e. RR ) |
| 144 | 143 | recnd | |- ( ( A e. NN /\ k e. ( 2 ... ( A + 1 ) ) ) -> ( 2 / ( sqrt ` ( k - 1 ) ) ) e. CC ) |
| 145 | 115 117 126 128 129 135 144 | telfsum | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` ( ( n + 1 ) - 1 ) ) ) ) = ( 2 - ( 2 / ( sqrt ` ( ( A + 1 ) - 1 ) ) ) ) ) |
| 146 | pncan | |- ( ( n e. CC /\ 1 e. CC ) -> ( ( n + 1 ) - 1 ) = n ) |
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| 147 | 31 32 146 | sylancl | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( n + 1 ) - 1 ) = n ) |
| 148 | 147 | fveq2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( sqrt ` ( ( n + 1 ) - 1 ) ) = ( sqrt ` n ) ) |
| 149 | 148 | oveq2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( 2 / ( sqrt ` ( ( n + 1 ) - 1 ) ) ) = ( 2 / ( sqrt ` n ) ) ) |
| 150 | 149 | oveq2d | |- ( ( A e. NN /\ n e. ( 2 ... A ) ) -> ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` ( ( n + 1 ) - 1 ) ) ) ) = ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) |
| 151 | 150 | sumeq2dv | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` ( ( n + 1 ) - 1 ) ) ) ) = sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) ) |
| 152 | nncn | |- ( A e. NN -> A e. CC ) |
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| 153 | pncan | |- ( ( A e. CC /\ 1 e. CC ) -> ( ( A + 1 ) - 1 ) = A ) |
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| 154 | 152 32 153 | sylancl | |- ( A e. NN -> ( ( A + 1 ) - 1 ) = A ) |
| 155 | 154 | fveq2d | |- ( A e. NN -> ( sqrt ` ( ( A + 1 ) - 1 ) ) = ( sqrt ` A ) ) |
| 156 | 155 | oveq2d | |- ( A e. NN -> ( 2 / ( sqrt ` ( ( A + 1 ) - 1 ) ) ) = ( 2 / ( sqrt ` A ) ) ) |
| 157 | 156 | oveq2d | |- ( A e. NN -> ( 2 - ( 2 / ( sqrt ` ( ( A + 1 ) - 1 ) ) ) ) = ( 2 - ( 2 / ( sqrt ` A ) ) ) ) |
| 158 | 145 151 157 | 3eqtr3d | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) = ( 2 - ( 2 / ( sqrt ` A ) ) ) ) |
| 159 | 2rp | |- 2 e. RR+ |
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| 160 | nnrp | |- ( A e. NN -> A e. RR+ ) |
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| 161 | 160 | rpsqrtcld | |- ( A e. NN -> ( sqrt ` A ) e. RR+ ) |
| 162 | rpdivcl | |- ( ( 2 e. RR+ /\ ( sqrt ` A ) e. RR+ ) -> ( 2 / ( sqrt ` A ) ) e. RR+ ) |
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| 163 | 159 161 162 | sylancr | |- ( A e. NN -> ( 2 / ( sqrt ` A ) ) e. RR+ ) |
| 164 | 163 | rpge0d | |- ( A e. NN -> 0 <_ ( 2 / ( sqrt ` A ) ) ) |
| 165 | 163 | rpred | |- ( A e. NN -> ( 2 / ( sqrt ` A ) ) e. RR ) |
| 166 | subge02 | |- ( ( 2 e. RR /\ ( 2 / ( sqrt ` A ) ) e. RR ) -> ( 0 <_ ( 2 / ( sqrt ` A ) ) <-> ( 2 - ( 2 / ( sqrt ` A ) ) ) <_ 2 ) ) |
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| 167 | 14 165 166 | sylancr | |- ( A e. NN -> ( 0 <_ ( 2 / ( sqrt ` A ) ) <-> ( 2 - ( 2 / ( sqrt ` A ) ) ) <_ 2 ) ) |
| 168 | 164 167 | mpbid | |- ( A e. NN -> ( 2 - ( 2 / ( sqrt ` A ) ) ) <_ 2 ) |
| 169 | 158 168 | eqbrtrd | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( 2 / ( sqrt ` ( n - 1 ) ) ) - ( 2 / ( sqrt ` n ) ) ) <_ 2 ) |
| 170 | 13 23 24 113 169 | letrd | |- ( A e. NN -> sum_ n e. ( 2 ... A ) ( ( log ` n ) / ( n x. ( n - 1 ) ) ) <_ 2 ) |