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Published online by Cambridge University Press: 20 November 2018
Let us associate to each open set U ⊂ Rn+1 the space HU of real functions f which are twice continuously differentiable in x1 . . . xn and once continuously differentiable in xn+1 and which satisfy the heat equation: Δf = ∂f/∂xn+1 where Then we have what in the axiomatic of Bauer is called a strong harmonic space [2, p. 61]. We will call functions of HUharmonic in U.