6 linear diff. eq. system. question



Hi,There are 6 linear diff. eq. system below.When I solve it, it return
false. 
Does anyone know how to solve it? Thank you.


denk1: 'diff(a(w),w,1)+q*b(w)=0
denk2: 'diff(c(w),w,1)-b(w)-(1+phi^2)*q*e(w)/d+(phi^2*R^2*f(w)/d)=0
denk3: 'diff(b(w),w,1)-c(w)-(1+phi^2)*q*d(w)/s+(phi^2*R^3*k*a(w)/s)=0
denk4: 'diff(e(w),w,1)-d(w)=0
denk5: 'diff(d(w),w,1)+e(w)-R*f(w)=0
denk6: 'diff(f(w),w,1)-k*q*a(w)=0

atvalue(b(w),w=0,0)
atvalue(e(w),w=0,0)
atvalue(f(w),w=0,0)

solution: desolve([denk1,denk2,denk3,denk4,denk5,denk6],
[a(w),b(w),c(w),d(w),e(w),f(w)])
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