Is there an explicit formula for the (logarithmic) capacity of a union of two disjoint disks? As far as I understand, one can assume without loss of generality that the disks have the same radii (otherwise apply a suitable Möbius transform etc.).
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$\begingroup$ Ah, already found: it's in Theorem 4.2 of arxiv.org/abs/1501.01812 $\endgroup$– Serguei PopovCommented May 31, 2016 at 18:07
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$\begingroup$ Hilbert-Courant, vol. 1 have the formula for the Green function of a ring. The formula you need is an easy consequence. $\endgroup$– Alexandre EremenkoCommented Jun 1, 2016 at 19:04
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