From: Solving Robin problems in multiply connected regions via an integral equation with the generalized Neumann kernel
n
\(\boldsymbol {\boldsymbol {\|u(\eta(t))-u_{n}(\eta(t))\|_{\infty}}}\)
32
\(1.69~(-2)\)
64
\(8.61~(-4)\)
128
\(4.98~(-5)\)
256
\(3.11~(-6)\)
512
\(1.99~(-7)\)
1,024
\(1.32~(-8)\)