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math.AG2019
A sufficient condition for local nonnegativity
Jia Xu, Yong Yao
A real polynomial is called local nonnegative at a point , if it is nonnegative in a neighbourhood of . In this paper, a sufficient condition for determining this propert…
math.AG2012
The expansion of real forms on the simplex and applications
Yong Yao, Jia Xu, Jingzhong Zhang
If n points B_1,---,B_n$ in the standard simplex Δ_n are affinely independent, then they can span an (n-1)-simplex denoted by Λ=Con(B_1,---,B_n). Here Λcorresponds to an n*n matrix…