3
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Reported also to WRI. [CASE:3965533]


I am in the process of updating Kamke differentional equations tests for 11.2 when encountered a new error I have not seen before on one of the Kamke ODE's (number 1586 in the Kamke book).

Could someone explain why this comes up now? Is this a new bug or a known issue?

ClearAll[y,x,A,a];
n=5;
ode=x*D[y[x],{x,n}]-(a*A[1]-A[0])*x-A[1]-((a*A[2]-A[1])*x+A[2])*
  y'[x]-((a*A[3]-A[2])*x+A[3])*y''[x]-((a*A[4]-A[3])*x+A[4])*
  y'''[x]-((a*A[5]-A[4])*x+A[5])*y''''[x]==0;

DSolve[ode,y[x],x]

Which gives

Mathematica graphics

No such message is generated in 11.1

Mathematica graphics

This is on windows 7, home edition. 64 bit.

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closed as off-topic by Daniel Lichtblau, m_goldberg, LCarvalho, Bob Hanlon, MarcoB Nov 4 '17 at 15:30

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  • $\begingroup$ Works fine on 11.0.1 for Microsoft Windows (32-bit) $\endgroup$ – zhk Oct 29 '17 at 4:17