  For compact subsets $E$ of the unit disk $ \mathbb{D}$ we study the capacity
of the condenser ${\rm cap}( \mathbb{D},E)$ by means of set functionals defined
in terms of hyperbolic geometry. In particular, we study experimentally the
case of a hyperbolic triangle and arrive at the conjecture that of all
triangles with the same hyperbolic area, the equilateral triangle has the least
capacity.
