Dear sage users and developers
trying to solve y''+4y=0 with initial conditions y(0)=0 and y'(0)=0
y=function('y',x)
eq=diff(y,x,2)+4*y==0
desolve(eq,y,ics=[0,0,0])
sage returns y(0)*cos(2*x) and not 0
What is wrong? The help for the desolve command shows the same
behavior on slighhtly more
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Hi,
I'm trying the following:
~sage: t = var('t')
~sage: x = function('x', t)
~sage: de = lambda y: diff(y,t) - y^4
~sage: desolve(de(x(t)),[x,t])
I get: 't+%c'
But x(t)=t is clearly not a solution o
