EN
A positive measurable function K on a domain D in $ℝ ^{n+1}$ is called a mean value density for temperatures if $u(0,0) = ∫∫_{D} K(x,t)u(x,t)dxdt$ for all temperatures u on D̅. We construct such a density for some domains. The existence of a bounded density and a density which is bounded away from zero on D is also discussed.