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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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D˚ukaz: f ′ f (z+h)−f (z)<br />

(z) = limh→0 h<br />

Jdeme po reálné ose:<br />

f ′ u(x + h, y) − u(x, y) v(x + h, y) − v(x, y)<br />

(z) = lim<br />

+ j<br />

h→0,h∈R h<br />

h<br />

= ∂u<br />

∂x<br />

∂v<br />

(x, y) + j (x, y) .<br />

∂x<br />

Jdeme po imaginární ose:<br />

f ′ u(x, y + h) − u(x, y) v(x, y + h) − v(x, y)<br />

(z) = lim<br />

+ j<br />

h→0,h∈R j h<br />

j h<br />

= 1<br />

j<br />

∂u ∂v<br />

(x, y) + (x, y) .<br />

∂y ∂y<br />

=⇒ ∂u<br />

∂x<br />

+ j ∂v<br />

∂x<br />

.<br />

= −j ∂u<br />

∂y<br />

=⇒ Cauchy-Riemannovy podmínky.<br />

+ ∂v<br />

∂y .<br />

Jan Hamhalter http://math.feld.cvut.cz/hamhalte Matematika pro Kybernetiku <strong>Lecture</strong> Notes 47 / 369

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