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Otra forma de convergencia, convergencia uniforme es definida y descrita en este modulo. También se muestra su relación con la convergencia puntual.

Convergencia uniforme de secuencias de funciones

para esta discusión, solo consideraremos las funciones con g n donde

Convergencia Uniforme
La secuencia n 1 g n converge uniformemente a la funció g si para cada ε 0 existe un entero N tal que n N implica que
g n t g t ε
para todo t .
Obviamente toda secuencia uniformemente continua es de convergencia puntual . La diferencia entre convergencia puntual y uniformemente continua es esta: Si g n converge puntualmente a g , entonces para todo ε 0 y para toda t hay un entero N que depende de ε y t tal que se mantiene si n N . Si g n converge uniformemente a g , es posible que para cada ε 0 enocntrar un entero N que será par todo t .

t t g n t 1 n Sea ε 0 dado. Entonces escoja N 1 ε . Obviamente, n n N g n t 0 ε para toda t . Así, g n t converge uniformemente a 0 .

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t t g n t t n Obviamente para cualquier ε 0 no podemos encontrar una función sencilla g n t para la cual la se mantiene con g t 0 para todo t . Así g n no es convergente uniformemente. Sin embargo tenemos: g n t g t puntual

La convergencia uniforme siempre implica convergencia puntual, pero la cpnvergencia puntual no necesariamente garantiza la convergencia uniforme.

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Problems

Pruebe rigurosamente si las siguientes funciones convergen puntualmente o uniformemente, o ambas.

  • g n t t n
  • g n t t n
  • g n t 1 n t t 0 0 t 0

Questions & Answers

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Source:  OpenStax, Señales y sistemas. OpenStax CNX. Sep 28, 2006 Download for free at http://cnx.org/content/col10373/1.2
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