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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 1. Grafiske/numeriske metoder 323<br />

1.22. Logistisk ligning ☞ [S] 7.5 The logistic equation<br />

Eksempel - fortsat<br />

2<br />

<br />

dP<br />

P(1 − P/K) =<br />

<br />

kdt<br />

integreres til løsninger<br />

4 P(t) =<br />

hvor<br />

A =<br />

K<br />

1 + Ae −kt<br />

K − P(0)<br />

P(0)<br />

1.23. Vækst ☞ [S] 7.4 Exponential growth and decay<br />

Definition<br />

dy<br />

1<br />

= ky<br />

dt<br />

Vækstligningen er separabel med løsninger<br />

<br />

dy<br />

y =<br />

<br />

kdt<br />

ln |y| = kt + C<br />

y = Ae kt

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