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)
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