The heat equation or diffusion equation is an important partial differential equation which describes the temperature in a given region over time. It is:
<math>u_t = k ( u_{xx} + u_{yy} + u_{zz} )</math>
Solutions will typically "even out" over time. The number k describes the heat conductivity[?] of the material.
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... in 1486. The first English translation
(1502) was by William Atkinson and Margaret,
mother of Henry VII., who did the fourth book.
Translations appeared in ...