顶点 定义
A vertex is a special point of a mathematical object and is usually a location where two or more lines or edges meet. In other terms, a vertex is a corner point of a geometric figure. For a polygon, vertices are where adjacent sides meet. For an angle, the vertex is where the two rays making up the angle meet. Vertices are most commonly encountered in angles, polygons, polyhedra, and graphs. Graph vertices are also known as nodes. If the figure is a curve or surface, the vertices are the points of maximum curvature.
来源
“Vertex.” From Wolfram MathWorld, mathworld.wolfram.com/Vertex.html.
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