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In Graph Theory , a ''graph'' describes a set of connections between objects. Each object is called a Node or Vertex . The connections themselves are called ''edges'' or ''arcs''. In Optics , a vertex (or surface vertex) is the point where the surface of an optical element crosses the Optical Axis . It is one of the Cardinal Points of an optical system. In Nuclear and Particle Physics , a vertex is the Interaction Point , where some subnuclear process occurs, changing the number and/or momenta of interacting particles or nuclei. In s because a vertex can be described as a vector from a coordinate system's origin. They are, however, two completely different things. In Anatomy , the vertex is the highest point of the Skull in the Anatomical Position (i.e. standing upright). It lies between the Parietal Bone s in the median sagittal plane. In Astrology , the vertex is a point in space seen near the Eastern horizon (and the Ascendant ) in the two-dimensional Horoscope . In astrological theory, planet(s) close to it are supposed to lend their personality to the event(s) that The Chart captures. '' Vertex '' is also an album by Buck 65 The Vertex of a Parabola is the lowest or highest point on the graph (where the derivative is zero); also known as the maximum or minimum of the parabola. SEE ALSO |