= Svein Linge
{c}
Svein Linge coauthored a text on <finite difference methods> with <Hans Petter Langtangen>. The book links mathematical discretization with implementations for <partial differential equations>, including <diffusion equations>. Deriving an update formula alongside its stability conditions explains why a physically smoothing equation can nevertheless produce an unstable numerical calculation if the time step is too large.<Finite Difference Computing with PDEs by Hans Petter Langtangen and Svein Linge>[Chapter 3, Section 3.1]{ref}
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