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Sage: var('x') Sage: y=function('y',x) Sage: a1=[y,e^x,x*e^x] Sage: a2=[diff(a1[0],x),diff(a1[1],x),diff(a1[2],x)] Sage: a3=[diff(a2[0],x),diff(a2[1],x),diff(a2[2],x)] Sage: m=matrix([a1,a2, a3]) Sage: r=m.determinant() Sage: r.expand()/e^(2*x)==0 Ecuacion diferencial lineal homogenea obtenida con Sagemath y(x) - 2*D[0](y)(x) + D[0, 0](y)(x)==0
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