#16793: ODE solve fails as assumption is not used by desolve
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: calculus | Keywords: assume, maxima
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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{{{
sage: var("a,b,c,k,r,q,i,j,m,n,p,s,t,x,y,z")
(a, b, c, k, r, q, i, j, m, n, p, s, t, x, y, z)
sage: assume(x^2+(-4*n-2)*x+1>0)
sage: f=function('f',x)
sage: desolve(x*diff(f(x),x,2)+(1-x)*diff(f(x),x)+n*f,f,ivar=x)
...
TypeError: Computation failed since Maxima requested additional
constraints; using the 'assume' command before evaluation *may* help
(example of legal syntax is 'assume(x^2+(-4*n-2)*x+1>0)', see `assume?`
for more details)
Is x^2+(-4*n-2)*x+1 positive or negative?
}}}
(the ODE of the Laguerre polynomials)
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Ticket URL: <http://trac.sagemath.org/ticket/16793>
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