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Elemente de algebra liniara.pdf

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Ecuat¸ii ¸si sisteme <strong>de</strong> ecuatii diferent¸iale liniare 157<br />

¸si<br />

e tA =<br />

∞<br />

k=0<br />

(tA) k<br />

k! =<br />

∞ t<br />

k=0<br />

k<br />

k! S<br />

⎛<br />

⎜<br />

⎝<br />

2 k 0 0<br />

0 (−1) k 0<br />

0 0 (−1) k<br />

⎞<br />

⎛<br />

⎟<br />

⎠ S −1 ⎜<br />

= S ⎝<br />

relat¸ie care permite scrierea explicită a solut¸iei generale.<br />

e 2t 0 0<br />

0 e −t 0<br />

0 0 e −t<br />

⎞<br />

⎟<br />

⎠ S −1

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