What's wrong with Лобачевский function?
Hello,
I tried to plot the following function $$Л(\theta) = -\int_0^\theta \log |2 \sin(u)| du$$ (called the Lobatchevski function). So I started with
sage: theta, u = var('theta', 'u')
sage: assume(0 < theta < pi)
sage: assume(theta, 'real')
sage: el(theta) = - integral(log(abs(2*sin(u))), u, 0, theta)
The last command just asks maxima. Maxima starts computing (one CPUS is running 100%) but never stops.
Vincent
Even that does not work:
This is actually pretty bizarre, and (sadly) yet another error in Maxima's
abs_integrate. I'm getting really frustrated with that package about now, even though it adds a lot of awesome integrals. See http://trac.sagemath.org/ticket/17468