A cryptarithm (also known as an alphametic) is a puzzle in which the digits of a mathematical formula (typically addition of two large numbers) are replaced by letters; the goal is to determine which letter stands for which digits. If arithmetic is done in a polynomially large radix, the problem becomes NP-complete.
Publications -- David Eppstein -- Theory Group -- Inf. & Comp. Sci. -- UC Irvine
Semi-automatically filtered from a common source file.