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

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

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

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9.10. Pˇríklad.<br />

n=0<br />

sin t<br />

f (t) = .<br />

t<br />

∞ (−1)<br />

f (t) =<br />

n t2n (2n + 1)! .<br />

n=0<br />

Zkoumejme konvergenci ˇrady<br />

∞ (−1) n ∞<br />

(2n)!<br />

(−1)<br />

=<br />

(2n + 1)! p2n+1 n<br />

.<br />

(2n + 1) p2n+1 n=0<br />

Tato ˇrada má stejný (vnitˇrní) poloměr konvergence jako ˇrada<br />

∞ 1<br />

,<br />

p2n+1 n=0<br />

která konverguje pro |p| > 1. Pro Laplace˚uv obraz F(p) máme<br />

∞ (−1)<br />

F (p) =<br />

n<br />

(2n + 1) p2n+1 pro Re p > 1 .<br />

n=0<br />

Jan Hamhalter http://math.feld.cvut.cz/hamhalte Matematika pro Kybernetiku <strong>Lecture</strong> Notes 253 / 369

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