フェルマーの最終定理の証明 (790ﾚｽ)
上下前次1-新
抽出解除 必死ﾁｪｯｶｰ(本家) (べ) 自ID ﾚｽ栞 あぼーん

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ﾘﾛｰﾄﾞ規制です｡10分ほどで解除するので､他のﾌﾞﾗｳｻﾞへ避難してください｡

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764: １３２人目の素数さん [] 08/31(日)10:48 ID:Bq8GdLuV(1/6)
f(z)=1/(1-z) z=i で展開
?@) |z-i|<√2
(1-i)(1-(z-i)/(1-i))=1-i+(1-i) (z-i)/(1-i)
1/(1-z)=1/(1-i-(z-i) )=1/(1-i)?1/(1-(z-i)/(1-i))
=1/(1-i) (1+((z-i)/(1-i))+((z-i)/(1-i))^2+((z-i)/(1-i))^3+?)
=(z-i)^0/(1-i)+(z-i)^1/(1-i)^2 +(z-i)^2/(1-i)^3 +?
=((1+i) (z-i)^0)/2+((1+i)^2 (z-i)^1)/2^2 +((1+i)^3 (z-i)^2)/2^3 +?
=納n=0→∞]((1+i)/2)^(n+1) (z-i)^n
※(1 )/(1-i)^2 =(1/(1-i))(1/(1-i))=(1+i)/((1-i)(1+i))((1+i)/(1-i)(1+i)) =(1+i)^2/2^2

?A) |z-i|>√2の場合
|z-i|/√2=|(z-i)/(1-i)|>1
すなわち、0<|(1-i)/(z-i)|<1となるから((1-i)/(z-i))^n の級数展開を考える。
1/(1-z)=1/(1-i-(z-i) )=-1/(z-i)?1/(1-(1-i)/(z-i))
=-1/(z-i) (1+((1-i)/(z-i))+((1-i)/(z-i))^2+((1-i)/(z-i))^3+?)
=-(1/(z-i)+(1-i)/(z-i)^2 +(1-i)^2/(z-i)^3 +?)
=-(1/(z-i)+2/(1+i)(z-i)^2 +2^2/?(1+i)^2 (z-i)?^3 +?)
=-((2^0 (z-i)^(-1))/(1+i)^0 +(2^1 (z-i)^(-2))/(1+i)^1 +(2^2 (z-i)^(-3))/(1+i)^2 +?)
=-(?(1+i)^0 (z-i)?^(-1)/2^0 +?(1+i)^(-1) (z-i)?^(-2)/2^(-1) +((1+i)^(-2) (z-i)^(-3))/2^(-2) +?)
=-納n=1→∞]((1+i)/2)^(1-n) (z-i)^(-n)
※(1-i)^2=(1-i)(1-i)=(1-i)(1+i)/(1+i)?(1-i)(1+i)/(1+i)=2^2/(1+i)^2
(1-i)^n=2^n/(1+i)^n

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765: １３２人目の素数さん [] 08/31(日)10:49 ID:Bq8GdLuV(2/6)
Δr↑=r↑(t+Δt)-r(t). |r↑|=Δs≒RΔθ.
R≒Δs/Δθ, Δx→0⇒Δs→0
1/R=lim[Δx→0])Δθ/Δs=dθ/ds
Δs=√((Δx)^2+(Δy)^2)=√((Δx)^2+(Δy)^2)/(Δx)^2 (Δx)^2 )=√(1+(Δy/Δx)^2 ) Δx
tan(Δθ)= tan(β-θ)=(tanβ-tanθ)/(1+tanβtanθ)=(y'(x+Δx)-y'(x))/(1+y'(x+Δx)y'(x))
Δθ≠tan(Δθ)=(y'(x+Δx)-y'(x))/(1+y'(x+Δx)y'(x))
Δθ/Δs=((y'(x+Δx)-y'(x))/(1+y'(x+Δx)y'(x)))/(√(1+(Δy/Δx)^2 )Δx)
=1/√(1+(Δy/Δx)^2 )?1/Δx?(y'(x+Δx)-y'(x))/(1+y'(x+Δx)y'(x))
=1/√(1+(Δy/Δx)^2 )?(y'(x+Δx)-y'(x))/Δx?1/(1+y'(x+Δx)y'(x))
1/R=dθ/ds=(lim)[Δx→0]Δθ/Δs
=1/√(1+(dy/dx)^2 )(d^2 y)/(dx^2 )1/(1+(dy/dx)^2 )
=((d^2 y)/(dx^2 ))/(1+(dy/dx)^2 )^(3/2)

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767: １３２人目の素数さん [] 08/31(日)13:03 ID:Bq8GdLuV(3/6)
M(θ)=E[e^θX ]=∫_(-∞)^∞??e^θx f(x)dx?
M(θ)=E[e^θX ]=1/(√2π σ) ∫_(-∞)^∞??e^θx e^(-(x-μ)^2/(2σ^2 )) ? dx=1/(√2π σ) ∫_(-∞)^∞?e^(θx-(x-μ)^2/(2σ^2 )) dx
θx-(x-μ)^2/(2σ^2 )=1/(2σ^2 ) (2σ^2 θx-(x-μ)^2 )=-1/(2σ^2 ) (? (x-μ)?^2-2σ^2 θx )
=-1/(2σ^2 ) (? x?^2+μ^2-2μx-2σ^2 θx )
=-1/(2σ^2 ) (? x?^2-2(μ+σ^2 θ)x+μ^2 )
=-1/(2σ^2 ) ((x-(μ+σ^2 θ))^2-(μ+σ^2 θ)^2+μ^2 )
=-1/(2σ^2 ) ((x-(μ+σ^2 θ))^2-(μ^2+2μσ^2 θ+σ^4 θ^2 )+μ^2 )
=-1/(2σ^2 ) ((x-(μ+σ^2 θ))^2-(2μσ^2 θ+σ^4 θ^2 ) )
=-(x-(μ+σ^2 θ))^2/(2σ^2 )+μθ+(σ^2 θ^2)/2
M(θ)=1/(√2π σ) ∫_(-∞)^∞?e^(θx-(x-μ)^2/(2σ^2 )) dx
=1/(√2π σ) ∫_(-∞)^∞?e^((-(x-(μ+σ^2 θ))^2/(2σ^2 )+μθ+(σ^2 θ^2)/2) ) dx
=1/(√2π σ) e^(μθ+(σ^2 θ^2)/2) ∫_(-∞)^∞?e^((-(x-(μ+σ^2 θ))^2/(2σ^2 )) ) dx
t=(x-(μ+σ^2 θ))/(√2 σ) x=√2 σt+μ+σ^2 θ dx=√2 σdt
(x-(μ+σ^2 θ))^2/(2σ^2 )=((x-(μ+σ^2 θ))/(√2 σ))^2=t^2
-∞<x?∞ ⇒-∞<t?∞

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769: １３２人目の素数さん [] 08/31(日)13:04 ID:Bq8GdLuV(4/6)
y''+y=sin(2x)
λ^2+1=0 λ=0±i
y_0=C_1 cos(x)+C_2 sin(x)
y_1=cos(x), y_2=sin(x)
?y_1?^'=-sin(x), ?y_2?^'=cos(x)
W=|?( cos(x)@-sin(x) )?( sin(x) @ cos(x) )|
=?cos?^2 (x)+?sin?^2 (x)=1
y_s (x)=-y_1 ∫?(y_2 R(x))/W dx+y_2 ∫?(y_1 R(x))/W dx
=-cos(x) ∫?sin(x)sin(2x) dx+sin(x) ∫?cos(x)sin(2x) dx
∫?sin(2x)sin(x) dx=-1/2 ∫??cos(2x+x)-cos(2x-x) ? dx
=-1/2 ∫??cos(3x)-cos(x) ? dx=-1/2?1/3 sin(3x)+1/2 sin(x)
=-1/6 sin(3x)+1/2 sin(x)
∫?sin(2x)cos(x) dx=1/2 ∫??sin(2x+x)+sin(2x-x) ? dx
=1/2 ∫??sin(3x)+sin(x) ? dx=1/2?(-1)/3 cos(3x)+(-1)/2 cos(x)
=-1/6 cos(3x)-1/2 cos(x)
y_s (x)
=-cos(x)(-1/6 sin(3x)+1/2 sin(x))+sin(x)(-1/6 cos(3x)-1/2 cos(x))
=1/6 sin(3x)cos(x)-1/2 sin(x)cos(x)-1/6 cos(3x)sin(x)-1/2 sin(x)cos(x)
=1/6 sin(3x-x)-sin(x)cos(x)=1/6 sin(2x)-1/2 sin(2x)
=-1/3 sin(2x)
∴y=C_1 cos(x)+C_2 sin(x)-1/3 sin(2x)

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773: １３２人目の素数さん [] 08/31(日)19:39 ID:Bq8GdLuV(5/6)
y_s=1/(D+i) (2i/(e^2ix+1)^2 )=e^(-ix) 1/D e^ix 2i/(e^2ix+1)^2 =e^(-ix) ∫(2ie^2ix)/(e^2ix+1)^2 dx
t=e^2ix+1 dt=2ie^2ix dx dx=dt/(2ie^2ix )
∫?(2ie^2ix)/(e^2ix+1)^2 dx?=∫?(2ie^2ix)/t^2 dt/(2ie^2ix )?=∫t^(-2) dt=-1/t=-1/(e^2ix+1)
y_s=e^(-ix) ∫(2ie^2ix)/(e^2ix+1)^2 dx=-e^(-ix)/(e^2ix+1)
=(- e^(-ix) (e^(-ix)+e^ix-e^ix ))/(e^(-ix) (e^2ix+1) ) =(- e^(-ix) (e^(-ix)+e^ix )+1)/(e^ix+e^(-ix) )
=- e^(-ix)+1/(e^ix+e^(-ix) )=- e^(-ix)+1/2cos(x)

y=C_1 cos(x)+C_2 sin(x)- e^(-ix)+1/2cos(x)
=C_1 cos(x)+C_2 sin(x)- cos(x)+isin(x)+1/2cos(x)
=(C_1-1)cos(x)+(C_2+i)sin(x)+1/2cos(x)
=Acos(x)+Bsin(x)+1/2cos(x)
y_s=1/2cos(x)
y=C_2 cos(x)+C_1 sin(x)- 1/2 cos(2x) 1/cos(x)
=C_2 cos(x)+C_1 sin(x)- 1/2 (2?cos?^2 (x)-1) 1/cos(x)
=C_2 cos(x)+C_1 sin(x)- (?cos?^2 (x)-1/2)/cos(x)
=C_2 cos(x)+C_1 sin(x)- cos(x)+1/2 1/cos(x)
=(C_2-1)cos(x)+C_1 sin(x)+1/2cos(x)
=Acos(x)+Bsin(x)+1/2cos(x)

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774: １３２人目の素数さん [] 08/31(日)19:39 ID:Bq8GdLuV(6/6)
f^((k) ) (z)=(n!/2πi)?_Cf(ζ)/(ζ-z)^(k+1)dζ
?@)n=1のとき
f(z)=1/( 2πi) ?_Cf(ζ)/((ζ-z) ) dζ
f(z+h)=1/( 2πi) ?_Cf(ζ)/(ζ-(z+Δz) ) dζ
f(z+h)-f(z)=1/( 2πi) ?_Cf(ζ)/(ζ-(z+h) )-f(ζ)/((ζ-z) ) dζ
=1/( 2πi) ?_Cf(ζ)((ζ-z)-(ζ-z-h))/(ζ-z-h)(ζ-z)dζ
=1/( 2πi) ?_Cf(ζ)(ζ-z-ζ+z+h)/(ζ-z-h)(ζ-z)dζ
=1/( 2πi) ?_Cf(ζ)h/(ζ-z-h)(ζ-z)dζ
=h/( 2πi) ?_Cf(ζ)/(ζ-z-h)(ζ-z)dζ
( f(z+h)-f(z))/h=1/( 2πi) ?_Cf(ζ)/(ζ-z-h)(ζ-z)dζ
　h→0
f'(z)= f^((1)) (z)=1/2πi ?_C(f(ζ))/(ζ-z)^2dζ
?A)n=k(k=1,2,3,…)のとき
f^((k)) (z)=k!/2πi ?_C(f(ζ))/(ζ-z)^(k+1)dζ ⇒f^((k+1)) (z)=(k+1)!/( 2πi) ?_Cf(ζ)/(ζ-z)^(k+2)dζ
f^((k)(z+h)- f^((k) ) (z))/h
=k!/( 2πih) ?_Cf(ζ)/(ζ-(z+h))^(k+1) -f(ζ)/(ζ-z)^(k+1)dζ
=k!/( 2πih) ?_C((ζ-z)^(k+1)-(ζ-z-h)^(k+1))/((ζ-z-h)^(k+1) (ζ-z)^(k+1) ) f(ζ)dζ??※
(a+b)^(k+1)
=(_k+1^ )C_0 a^n b^0+(_k+1^ )C_1 a^(k+1-1) b^1+(_k+1^ )C_2 a^(k+1-2) b^2+?+(_k+1^ )C_r a^(k+1-r) b^r+?+b^(k+1)
=a^(k+1)+(k+1) a^k b+(_k+1^ )C_2 a^(k-1) b^2+?+(_k+1^ )C_r a^(k+1-r) b^r+? +b^(k+1)
(ζ-z-h)^(k+1)
=(ζ-z)^(k+1)-(k+1) (ζ-z)^k h + (_k+1^ )C_2 (ζ-z)^(k-1) h^2-?+h^(k+1)
(ζ-z)^(k+1)-(ζ-z-h)^(k+1)
=(k+1) (ζ-z)^k h-(_k+1^ )C_2 (ζ-z)^(k-1) h^2+?-h^(k+1)
( f^((k) ) (z+h)- f^((k) ) (z))/h
=k!/( 2πih) ?_C((k+1) (ζ-z)^k h-(_k+1^ )C_2 (ζ-z)^(k-1) h^2+?-h^(k+1))/((ζ-z-h)^(k+1) (ζ-z)^(k+1) ) f(ζ)dζ
=(k+1)!/( 2πi) ?_Cf(ζ)/((ζ-z-h)^(k+1) (ζ-z) ) dζ-k!/( 2πi) ?_C((_k+1^ )C_2 (ζ-z)^(k-1) h-?+h^k)/((ζ-z-h)^(k+1) (ζ-z)^(k+1) ) f(ζ)dζ
　h→0
f^((k+1)) (z)=(k+1)!/(2πi) ?_Cf(ζ)/(ζ-z)^(k+2)dζ

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上下前次1-新書関写板覧索設栞歴

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