On 2D Inverse Problems/Notation

$\mathbb{N}\text{ of natural numbers}$

$𝔻\text{ is the open disc domain}$

$𝕓\text{ is the open domain nature boundary}$

${ℂ}^{\pm }\text{ is the complex half-plane}$

$mega\text{ is a root of unity}$

$\mathrm{\nabla }\text{ is the gradient}$

$\mathrm{\Delta }=\mathrm{\nabla }\cdot \mathrm{\nabla }\text{ is the Laplace operator}$

$\mathrm{\Lambda }\text{ is Dirichlet-to-Neumann operator}$

$D_x\text{ is a diagonal matrix w/the vector }x\text{ on the diagonal }(D_{x}1=x)$

$D_A\text{ is the diagonal matrix, coinciding on diagonal w/the matrix }A$

$y,\lambda \text{ is eigenvalue of operator/matrix}$

$ma(A)\text{ is spectrum of matrix }A,\text{ zeros of characteristic polynomial }$

$\rho (A)\text{ is the characteristic polynomial of matrix }A$

$\tau \text{ is the Cayley transform}$

$ega\text{ is a continuous domain}$

$G/G^{*}\text{ is graph or network and its dual}$

$V_G\text{ is the set of vertices of a graph}$

$E_G\text{ is the set of edges of a graph}$

$M_G\text{ is the medial graph of an embedded graph }G$

$c\text{ is conductivity}$