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UBA - CienciaS • Ver Tema - [no resuelto] sobre conjuntos y topología
UBACS Q&A Foro WikiCS
Fecha actual 17 May 2024, 14:53




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 Asunto: [no resuelto] sobre conjuntos y topología
NotaPublicado: 29 Nov 2009, 17:27 
Profesor

Registrado: 08 Ago 2008, 21:57
Mensajes: 299
Sean K compacto y A abierto tales que Probar que existe un abierto U tal que

Pensé en proponer el u y ver que sirve... pero no sé como proponerlooo!!! no se me ocurre otra cosa.


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 Asunto: Re: [no resuelto] sobre conjuntos y topología
NotaPublicado: 29 Nov 2009, 17:59 
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Registrado: 17 May 2008, 23:04
Mensajes: 812
Bueno, tiro una idea:



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I offer her that kernel of myself that I have saved, somehow; the central heart that deals not in words, traffics not with dreams and is untouched by time, by joy, by adversities
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 Asunto: Re: [no resuelto] sobre conjuntos y topología
NotaPublicado: 06 Dic 2009, 12:58 
Profesor

Registrado: 08 Ago 2008, 21:57
Mensajes: 299
Con ese U es claro que est´a contenido en A pero su clausura no tanto...
lo que hice siguiendo la idea es tomar bolas de radio la mitad de cada radio elegido previamente. Sigue siendo la unión un cubrimiento de K que admite subcubrimiento finito. Y ahí si es claro que la clausura de U se mete en A.

¿habría qe escribir algo más¡? oestá bien?


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