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Analysis-suitable T-splines are a topological restricted subset of T-splines,which are opti-mized to meet the needs for design and analysis.The paper independently derives a class of bi-degree(d1; d2)T-splines for which no perpendicular T-junction extensions intersect,and provides a new proof for the linearly independence of the blending functions.We also prove that the sum of the basis functions is one for an AS T-spline if the T-mesh is admissible based on a recursive relation.