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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 3. Generelle metoder 363<br />

3.29. Lotka-Volterra stabilitet ☞ [LA] 18 Stabilitet<br />

Eksempel 2<br />

For Lotka-Volterra systemet,<br />

a,b,k,r > 0,<br />

dR<br />

= kR − aRW<br />

er der to ligevægtsløsninger<br />

dt<br />

dW<br />

dt<br />

= −rW + bRW<br />

(R,W) = (0,0), (R,W) = (r/b,k/a)<br />

3.30. Lotka-Volterra stabilitet ☞ [LA] 18 Stabilitet<br />

Eksempel 2 - fortsat<br />

I (R,W) = (0,0) er den lineære approximation<br />

som giver en ustabil ligevægt.<br />

dR<br />

= kR<br />

dt<br />

dW<br />

= −rW<br />

dt<br />

3.31. Lotka-Volterra stabilitet ☞ [LA] 18 Stabilitet

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