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Article #20Re: tre serie (tres series)
From: Dr. Wolfgang Hintze
Date: Sun, 06 Nov 2011 08:29
Date: Sun, 06 Nov 2011 08:29
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3965 bytes
"Dr. Wolfgang Hintze" <weh@snafu.de> schrieb im Newsbeitrag news:9hmci0Fj94U1@mid.uni-berlin.de... > > "Ignacio Larrosa Ca�estro" <ilarrosaQUITARMAYUSCULAS@mundo-r.com> > schrieb im Newsbeitrag news:9hkhdgFqm6U1@mid.individual.net... >> superpollo wrote: >>> A = sum(1/((2n-1)(3n-1)),n,1,inf) >> >> rq(3)pi/6 - ln(27/16)/2 >> >>> B = sum(1/((2n-1)(4n-1)),n,1,inf) >> >> pi/4 - ln(2)/2 (esta es la m�s f�cil) >> >>> C = sum(1/((3n-1)(4n-1)),n,1,inf) >> >> 3ln(3/4)/2 + pi(3 - rq(3))/6 >> >> Hoy estar� fuera todo el dia, ma�ana lo justifico si nadi4e lo ha >> hecho antes. >> >> >> -- >> Saludos, >> >> Ignacio Larrosa Ca�estro >> A Coru�a (Espa�a) >> ilarrosaQUITARMAYUSCULAS@mundo-r.com >> http://www.xente.mundo-r.com/ilarrosa/GeoGebra/ > > Estoy en el camino de estudiar los productos > > pA (x) = Product ( 1 - x/((2n-1)(3n-1),(n,1,oo) ) = Product ( 1 - > x/((2n+1)(3n+2),(n,0,oo) ) > pB (x) = Product ( 1 - x/((2n-1)(4n-1),(n,1,oo) ) = Product ( 1 - > x/((2n+1)(3n+3),(n,0,oo) ) > pC (x) = Product ( 1 - x/((3n-1)(4n-1),(n,1,oo) ) = Product ( 1 - > x/((3n+2)(4n+3),(n,0,oo) ) > > o m�s generalmente > > para k>1, m>1 > > pG (x) = Product ( 1 - x/((k.n-1)(m.n-1),(n,1,oo) )= Product ( 1 - > x/((k.n+(k-1))(m.n+(m-1)),(n,1,oo) ), > > Desarollando estos productos por potencias de x nos da en el primero > coeficiente las sumas buscadas. > > Ahora, los pX(x) son funciones holomorfas (es correcto en > castellano?) en x y tienen ceros en los puntos > > x = ((k.n+(k-1))(m.n+(m-1)) = (k.m)n^2 -(k+m)n + 1, n=1,2,... > > Solucionando la cuadr�tica por n nos da > > n1 = (k + m - 2 k m + Sqrt[k^2 - 2 k m + m^2 + 4 k m x])/(2 k m)} > n2 = (k + m - 2 k m - Sqrt[k^2 - 2 k m + m^2 + 4 k m x])/(2 k m)}} > > La funci�n pG(x) tiene ceros en todos los puntos n+ y n- = 0,1,2,... > > Por eso podemos sospechar que (Gamma(z) = la funci�n Gamma de Euler, > que tiene ceros en z=0,-1,-2, ---) > > pG(x) = cte /( (Gamma(-n1(x))(Gamma(-n2(x)) ) > > donde cte = (Gamma(-n1(x=0))(Gamma(-n2(x=0)) ya que pG(x=0)=1. > > Ejemplos > > pA(x) = (Sqrt[Pi] Gamma[2/3])/(Gamma[(1/12) (7 - Sqrt[1 + 24 x])] > Gamma[(1/12)(7 + Sqrt[1 + 24 x])]) > > pB(x) = (Sqrt[Pi]Gamma[3/4])/(Gamma[5/8 - (1/8)Sqrt[1 + 8 x]] > Gamma[(1/8)(5 + Sqrt[1 + 8x])]) > > pC(x) = (Gamma[2/3]Gamma[3/4])/(Gamma[(1/24)(17 - Sqrt[1 + 48 x])] > Gamma[(1/24)(17 + Sqrt[1 + 48 x])]) > > ... tengo que acabar con eso por el momento... > > Saludos, > Wolfgang Me corrijo: (Gamma(z) = la funci�n Gamma de Euler, que tiene ceros en z=0,-1,-2, ---) deber�a haber le�do (Gamma(z) = la funci�n Gamma de Euler, que tiene *polos simples* en z=0,-1,-2, ...) y a�ado: Por lo tanto 1/Gamma(z) es cero en z = 0, -1, -2, ... Saludos, Wolfgang
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From: "Dr. Wolfgang Hintze" <weh@snafu.de>
Newsgroups: it.scienza.matematica,es.ciencia.matematicas
Subject: Re: tre serie (tres series)
Date: Sun, 6 Nov 2011 09:29:21 +0100
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