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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 2. 1. ordens ligninger 329<br />

hvor C er arbitrœr og<br />

<br />

<br />

A(x) = a(x)dx, B(x) = e −A(x) b(x)dx<br />

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

Sætning 23, 25 - Bevis<br />

z(x) = e −A(x) y(x)<br />

opfylder ligningen<br />

som integreres til<br />

og forlænges til<br />

dz<br />

dx = e−A(x) b(x)<br />

z(x) = B(x) + C<br />

y(x) = Ce A(x) + B(x)e A(x)<br />

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

Metode<br />

dy<br />

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

dx

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