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Lecture notes 2011 (slides), pdf.file - Katedra matematiky FEL ČVUT

Lecture notes 2011 (slides), pdf.file - Katedra matematiky FEL ČVUT

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Pˇríklady<br />

• geometrická ˇrada<br />

∞<br />

z n = 1 + z + z 2 + · · ·<br />

n=0<br />

Konverguje právě tehdy když |z| < 1 se součtem<br />

1 + z + z 2 + · · · = 1<br />

1 − z .<br />

Otázka stejnoměrné konvergence:<br />

Sm(z) =<br />

m<br />

z n =<br />

n=0<br />

1 − zm+1<br />

1 − z<br />

Na M = {z | |z| < 1} nemáme stejnoměrnou konvergenci<br />

nebot’:<br />

<br />

<br />

sup |Sm(z)−S(z)| = sup<br />

1 − z<br />

<br />

z∈M<br />

z∈M<br />

m+1<br />

<br />

1 <br />

− <br />

|z|<br />

1 − z 1 − z = sup<br />

z∈M<br />

m+1<br />

= ∞ .<br />

|1 − z|<br />

Jan Hamhalter http://math.feld.cvut.cz/hamhalte Matematika pro Kybernetiku <strong>Lecture</strong> Notes 110 / 369<br />

.

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