Opened 5 years ago

Last modified 5 years ago

#16793 new defect

ODE solve fails as assumption is not used by desolve

Reported by: rws Owned by:
Priority: major Milestone: sage-6.4
Component: calculus Keywords: assume, maxima
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

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)

Change History (1)

comment:1 Changed 5 years ago by vbraun_spam

  • Milestone changed from sage-6.3 to sage-6.4
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