The convexity of curves and surfaces is an important property in the field of Computer Aided Geometric Design (CAGD). This paper tries to tackle the positive and convex problem of polynomials.

• 在计算机辅助几何设计（CAGD）中；曲面曲线的凸性是一种重要的特性旨在解决多项式的正性和凸性问题.