From: Solving Robin problems in multiply connected regions via an integral equation with the generalized Neumann kernel
n
\(\boldsymbol {\|u(\eta(t))-u_{n}(\eta(t))\|_{\infty}}\)
32
\(1.23~(-2)\)
64
\(2.88~(-4)\)
128
\(2.28~(-5)\)
256
\(1.61~(-6)\)
512
\(1.07~(-7)\)
1,024
\(7.11~(-9)\)