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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... (as Charles V) from 1519-1558; he was also King of Spain from 1516-1556 -- officially as Charles I of Spain, although often referred to as Charles V ("Carlos Quinto" or ...