#9961: Allow assumptions on the dependent variable in desolve
----------------------------+-----------------------------------------------
Reporter: robert.marik | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
----------------------------+-----------------------------------------------
Sage should be able to solve ODE
{{{
x*diff(y,x)-x*sqrt(y^2+x^2)-y == 0
}}}
under assumptions
{{{
x>0,y>0
}}}
Now
{{{
y=function('y',x)
assume(y>0)
}}}
passes
{{{
assume(y(x)>0)
}}}
to Maxima. As a consequence, Maxima asks on sign of y. This should be
fixed,
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9961>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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