Recently there has been tremendous interest in counting the numberof integral points of n-dimensional tetrahedra with non-integral vertices due to applica-tions in primality testing and factoring in the number theory and in singularity theory.Let △(a1,...,an) be an n-dimensional tetrahedron with non-integral vertices describedby x1/a1 +···+xn/an ≤1,x1 ≥0, ..., xn ≥0 where a1 ≥···≥an are any given positive realnumbers. P(a1,...,an) :=#{(x1,...,xn) ∈Zn+n |Σi=1n xi/ai ≤1}. It was Conjecturedthat n!P(a1,...,an) ≤(a1 -1)···(an -1), where a1 ≥···≥an ≥2. The purposeof this paper is to formulate the conjecture on sharp upper estimate of the number ofintegral points in 5-dimensional tetrahedra with non-integral vertices.
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