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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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Vzdálenost bod˚u z1, z2: |z1 − z2|.<br />

Nerovnosti<br />

1 | Re z|, | Im z| ≤ |z|<br />

2 |z + w| ≤ |z| + |w| (trojúhelníková nerovnost)<br />

3 |z + w| ≥ | |z| − |w| |<br />

4 |z| ≤ | Re z| + | Im z|.<br />

D˚ukaz (2)<br />

|z + w| 2 = (z + w)(z + w) = |z| 2 + |w| 2 + (wz + zw) =<br />

(3)<br />

= |z| 2 + |w| 2 + 2 Re(zw) ≤ |z| 2 + |w| 2 + 2 |z||w| =<br />

= (|z| + |w|) 2 .<br />

|z| = |z + w − w| ≤ |z + w| + |w|<br />

|w| = |z + w − z| ≤ |z + w| + |z|<br />

Jan Hamhalter http://math.feld.cvut.cz/hamhalte Matematika pro Kybernetiku <strong>Lecture</strong> Notes 12 / 369

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