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Published online by Cambridge University Press: 22 January 2016
Let Rn+1 = Rn × R be the (n + 1)-dimensional Euclidean space with n ≥ 1. We denote by X = (x, t) a point in Rn+1 with x ∈ Rn and t ∈ R. Consider the parabolic operator on Rn+1:
where 0 < a ≤ 1 and Δ denotes the Laplacian on Rn.