[過去ﾛｸﾞ] 現代数学の系譜 工学物理雑談 古典ガロア理論も読む46 (692ﾚｽ)
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167: 2017/11/14(火)21:03:59.78 ID:v/i8VeKy(3/3) AAS
>>157
> >>156
> 定義の定義を述べよ
こういうウケないことを言うID:xUezoIEB＝ぷ君ｗ
181(2): 2017/11/15(水)19:42:29.78 ID:fz0TcIh0(2/3) AAS
>>174
＞要は、1/q^v でvの臨界指数で類別する。それはおれも考えていた
無理するな
＞数学的にはどこか臨界指数があるだろう
微分可能な点が出てくるところを臨界といってるなら、2を超えた瞬間
ところで貴様は英語が読めないみたいだから教えてやるが
任意のｎで、微分不可能な無理数は存在する
さらにいえば、1/q^nを1/e^(-q)に置き換えても
リュービル数では微分不可能外部ﾘﾝｸ[pdf]:kbeanland.files.wordpress.com
203: 2017/11/16(木)13:53:40.78 ID:/MLxWF5k(4/5) AAS
>>200 補足
外部ﾘﾝｸ[pdf]:www.unirioja.es
DIFFERENTIABILITY OF A PATHOLOGICAL FUNCTION,
DIOPHANTINE APPROXIMATION,
AND A REFORMULATION
OF THE THUE-SIEGEL-ROTH THEOREM 2009
抜粋引用
In the opinion of this author, fν is a very
interesting function, and it is worthwhile to continue analyzing its behaviour.
In this way, we find examples of functions whose properties about con-
tinuity and dierentiability are pathological at the same time. For every
ν > 0, the function fν is continuous at the irrationals and discontinuous
at the rationals. And, when ν > 2 (that is the most interesting case), we
prove that fν is dierentiable in a set Dν
It is astonishing that, dierentiability being a local concept, fν is dieren-
tiable almost everywhere in spite of the fact that it is not continuous at any
rational number.
We finish the paper by showing a reformulation of the Thue-Siegel-Roth
theorem in terms of the dierentiability of fν for ν > 2 (see Theorem 3
and the final Remark). It seems really surprising that a theorem about dio-
phantine approximation is equivalent to another theorem about the dier-
entiablity of a real function: a nice new connection between number theory
and analysis! As far as I know, this characterization of the Thue-Siegel-Roth
theorem has not been previously observed.
Remark 1. The pathological behavior of functions is a useful source of
examples that help to understand the rigorous definitions of the basic con-
cepts in mathematical analysis. In this respect, it is interesting to note that,
here, we have shown a kind of pathological behaviour that is dierent from
that of the more commonly studied: the existence of continuous nowhere
dierentiable real functions, whose most typical example is the Weierstrass
function
4. The theorem of Thue-Siegel-Roth revisited
327(6): 2017/11/19(日)03:44:12.78 ID:1qHHV2xH(1/4) AAS
もとの箱入り無数目の方だと
開陳しない状況で
最小である確率は確かに99/100
しかし
他の選択肢を開陳した時点で
それらの最大値が確定するから
それよりも小さい確率は0になるんだな
596(1): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2017/11/26(日)23:26:10.78 ID:1WQ1V5QH(31/34) AAS
>>575 補足
原本PDFを見て貰った方が視認性は良いが、後の検索性のためにコピペする（＾＾
外部ﾘﾝｸ[pdf]:www.unirioja.es
DIFFERENTIABILITY OF A PATHOLOGICAL FUNCTION, DIOPHANTINE APPROXIMATION, AND A REFORMULATION OF THE THUE-SIEGEL-ROTH THEOREM JUAN LUIS VARONA 2009
(抜粋)
P7
4. The theorem of Thue-Siegel-Roth revisited
Or, equivalently, if x is an irrational algebraic number, there exists a positive constant C(x, α) such
that ｜x - p/q ｜< C(x, α)/q^(2+α) (10)
has no rational solution.
P8
Remark 3. We have proved Theorem 3 by using the Thue-Siegel-Roth theorem.
But we have said that it is a reformulation. So, let us see how to
deduce the Thue-Siegel-Roth theorem from Theorem 3.
Given x algebraic and irrational, and ν > 2, Theorem 3 ensures that fν
is differentiable at x, so there exists
lim y→x {fν(y) - fν(x)}/(y - x) = f’ν (x).
By approximating y → x by irrationals y, it follows that f’ν (x) = 0.
Consequently, by approximating y → x by rationals, i.e., y = p/q, we also must have
lim p/q→x ｛fν(p/q) - fν(x)｝/(p/q - x ) = lim p/q→x (1/qν)/(p/q - x) = 0.
Then, for every ε > 0, there exists δ > 0 such that
1/(q^ν) <= ε｜p/q - x｜
when p/q ∈ (x - δ, x + δ). From here, it is easy to check that the same
happens for every p/q ∈ Q, perhaps with a greather constant ε' in the place
of ε. Thus, (10) with α = ν-2 and some positive constant C(x, α) = 1/ε' has
no rational solution, and we have obtained the Thue-Siegel-Roth theorem.
(引用終り)
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