04.06.2013 Views

Carlos Ivorra Castillo AN´ALISIS MATEM´ATICO - Tecnologia-Tecnica

Carlos Ivorra Castillo AN´ALISIS MATEM´ATICO - Tecnologia-Tecnica

Carlos Ivorra Castillo AN´ALISIS MATEM´ATICO - Tecnologia-Tecnica

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

2.7. Apéndice: El teorema de Baire 99<br />

Recíprocamente, supongamos que x ∈ G. Dado ɛ>0 tomamos n tal que<br />

1/n 0 tal que<br />

Entonces si y ∈ Bδ(x) se tiene que<br />

luego f es continua en x.<br />

sup f(y) − ínf f(y) < 1/n.<br />

y∈Bδ(x) y∈Bδ(x)<br />

|f(x) − f(y)| ≤ sup f(y) − ínf f(y) < 1/n 0,<br />

0 en caso contrario.<br />

Demostrar que lím f(x) = 0 para todo x0 ∈ R. Deducir que f es continua en R \ Q<br />

x→x0<br />

y discontinua en Q.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!