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The Guillemin boundary condition appears naturally in the study of K\"ahler geometry of toric manifolds. In the present paper, the following Guillemin boundary value problem is investigated align eq1 & D² u=h (x) ₈=₁N lᵢ (x), P Rⁿ, (1) \\ bdy1 &u (x) -₈=₁N lᵢ (x) lᵢ (x) C^ (P). (2) align Here equation* 00\} equation* is a simple convex polytope in Rⁿ. The solvability of (1) - (2) is given under the necessary and sufficient condition. The key issue in the proof is to obtain the boundary regularity of u (x) - ₈=₁N lᵢ (x) lᵢ (x). Due to the difficulty caused by the structure of the equation itself and the singularity of P, we need to pay special attention to the influence of the difference of singularity types at different positions on P on the behavior of u in its vicinity.
Huang et al. (Sat,) studied this question.
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