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
\(1.38~(-2)\)
64
\(9.62~(-4)\)
128
\(6.47~(-5)\)
256
\(3.87~(-6)\)
512
\(4.73~(-7)\)
1,024
\(6.57~(-8)\)