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UBA - CienciaS :: Ver Tema - Intercambio entre sumatoria y límite
UBA - CienciaS
http://ubacs.com.ar/ubacs/

Intercambio entre sumatoria y límite
http://ubacs.com.ar/ubacs/viewtopic.php?f=81&t=2973
Página 1 de 1

Autor:  Peperino [ 08 Sep 2013, 22:11 ]
Asunto:  Intercambio entre sumatoria y límite

Hola a todos:

Necesito ayuda para el siguiente problema.

Sean funciones tales que para cada n, el existe y es igual a .

Si la serie (con la norma supremo) es convergente entonces la serie converge y





Muchas gracias y saludos. :)

Autor:  Quimey [ 09 Sep 2013, 17:18 ]
Asunto:  Re: Intercambio entre sumatoria y límite

Si escribís lo que intentaste y donde te trabaste te doy una mano...

Autor:  Peperino [ 10 Sep 2013, 11:16 ]
Asunto:  Re: Intercambio entre sumatoria y límite

Hola Quimey: (¿El mismo del Rincón Matemático?)
Gracias por contestar.
De todos modos ya pude resolver el problema.
En este orden:

1) Demostré que converge en norma y por lo tanto uniformemente.

2) Demuestro que converge.

3) Con los resultados anteriores, uso la definición de límite para demostrar que
.

¿Me podrás dar un contraejemplo de que no se puede hacer el intercambio entre suma y límite cuando no es convergente?

Gracias y saludos. :)

Autor:  Quimey [ 10 Sep 2013, 16:41 ]
Asunto:  Re: Intercambio entre sumatoria y límite

No soy el mismo de rincon matemático. Después veo si puedo encontrar el contraejemplo.

Autor:  Peperino [ 12 Sep 2013, 09:01 ]
Asunto:  Re: Intercambio entre sumatoria y límite


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