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Question: dsolve Warning, it is required that the numerator of the given ODE depends on the highest derivative. Returning NULL.

Question:dsolve Warning, it is required that the numerator of the given ODE depends on the highest derivative. Returning NULL.

nm 10401 Maple 2022
ode dsolve differential-equations warning
May 10 2022
3

To Maple support,

Why when removing symbol a from these equations makes Maple warning go away? This is from a textbook. Attached worksheet. 

 

restart;
ode:={diff(x__1(t),t)*sin(x__2(t))=x__4(t)*sin(x__3(t))+x__5(t)*cos(x__3(t)),diff(x__2(t),t)= x__4(t)*cos(x__3(t))-x__5(t)*sin(x__3(t)),diff(x__3(t),t)+diff(x__1(t),t)*cos(x__2(t))= 1,diff(x__4(t),t)-(1-B)*a*x__5(t)= sin(x__2(t))*cos(x__3(t)),diff(x__5(t),t)+(1-B)*a*x__4(t)=sin(x__2(t))*sin(x__3(t))};
dsolve(ode)

restart;
ode:={diff(x__1(t),t)*sin(x__2(t))=x__4(t)*sin(x__3(t))+x__5(t)*cos(x__3(t)),diff(x__2(t),t)= x__4(t)*cos(x__3(t))-x__5(t)*sin(x__3(t)),diff(x__3(t),t)+diff(x__1(t),t)*cos(x__2(t))= 1,diff(x__4(t),t)-(1-B)*x__5(t)= sin(x__2(t))*cos(x__3(t)),diff(x__5(t),t)+(1-B)*a*x__4(t)=sin(x__2(t))*sin(x__3(t))};
dsolve(ode)

worksheet attached also

> 

interface(version)

`Standard Worksheet Interface, Maple 2022.0, Windows 10, March 8 2022 Build ID 1599809`

> 

Physics:-Version();

`The "Physics Updates" version in the MapleCloud is 1230 and is the same as the version installed in this computer, created 2022, April 21, 9:8 hours Pacific Time.`

> 

restart;
> 

ode:={diff(x__1(t),t)*sin(x__2(t))=x__4(t)*sin(x__3(t))+x__5(t)*cos(x__3(t)),diff(x__2(t),t)= x__4(t)*cos(x__3(t))-x__5(t)*sin(x__3(t)),diff(x__3(t),t)+diff(x__1(t),t)*cos(x__2(t))= 1,diff(x__4(t),t)-(1-B)*a*x__5(t)= sin(x__2(t))*cos(x__3(t)),diff(x__5(t),t)+(1-B)*a*x__4(t)=sin(x__2(t))*sin(x__3(t))};
dsolve(ode)

{(diff(x__1(t), t))*sin(x__2(t)) = x__4(t)*sin(x__3(t))+x__5(t)*cos(x__3(t)), diff(x__3(t), t)+(diff(x__1(t), t))*cos(x__2(t)) = 1, diff(x__4(t), t)-(1-B)*a*x__5(t) = sin(x__2(t))*cos(x__3(t)), diff(x__5(t), t)+(1-B)*a*x__4(t) = sin(x__2(t))*sin(x__3(t)), diff(x__2(t), t) = x__4(t)*cos(x__3(t))-x__5(t)*sin(x__3(t))}

Warning, it is required that the numerator of the given ODE depends on the highest derivative. Returning NULL.

> 

restart;
> 

ode:={diff(x__1(t),t)*sin(x__2(t))=x__4(t)*sin(x__3(t))+x__5(t)*cos(x__3(t)),diff(x__2(t),t)= x__4(t)*cos(x__3(t))-x__5(t)*sin(x__3(t)),diff(x__3(t),t)+diff(x__1(t),t)*cos(x__2(t))= 1,diff(x__4(t),t)-(1-B)*x__5(t)= sin(x__2(t))*cos(x__3(t)),diff(x__5(t),t)+(1-B)*a*x__4(t)=sin(x__2(t))*sin(x__3(t))};
dsolve(ode)

{(diff(x__1(t), t))*sin(x__2(t)) = x__4(t)*sin(x__3(t))+x__5(t)*cos(x__3(t)), diff(x__3(t), t)+(diff(x__1(t), t))*cos(x__2(t)) = 1, diff(x__4(t), t)-(1-B)*x__5(t) = sin(x__2(t))*cos(x__3(t)), diff(x__5(t), t)+(1-B)*a*x__4(t) = sin(x__2(t))*sin(x__3(t)), diff(x__2(t), t) = x__4(t)*cos(x__3(t))-x__5(t)*sin(x__3(t))}

> 

 

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