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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 2. 1. ordens ligninger 328<br />

hvor C er arbitrœr og<br />

<br />

A(x) = a(x)dx<br />

2.8. 1. ordens lineær ligning<br />

Sætning 24 - Bevis<br />

☞ [LA] 14 Lineær differentialligning<br />

dy<br />

= a(x)y<br />

dx<br />

er separabel med løsninger<br />

<br />

dy<br />

y =<br />

<br />

a(x)dx<br />

ln |y| = A(x) + K<br />

y(x) = Ce A(x)<br />

2.9. 1. ordens lineær ligning ☞ [LA] 14 Lineær differentialligning<br />

Sætning 25<br />

Den generelle lineœre ligning<br />

dy<br />

= a(x)y + b(x)<br />

dx<br />

har fuldstœndig løsning<br />

y(x) = Ce A(x) + B(x)e A(x)

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