Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, the Robin (or third type) boundary condition is a type of boundary condition, named after Victor Gustave Robin (1855-1897) who lectured in mathematical physics at the Sorbonne in Paris and worked in the area of thermodynamics. When imposed on an ordinary or a partial differential equation, it is a specification of a linear combination of the values of a function and the values of its derivative on the boundary of the domain. Robin should be pronounced as a French name, although many English-speaking mathematicians anglicize the word. Robin boundary conditions are a weighed combination of Dirichlet boundary conditions and Neumann boundary conditions. This contrasts to mixed boundary conditions, which are boundary conditions of different types specified on different subsets of the boundary. Robin boundary conditions are also called impedance boundary conditions, from their application in electromagnetic problems.