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# vertex: Wikis

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# Encyclopedia

## Contents

Vertex (Latin: corner; plural vertices or vertexes) may refer to:

## Physics

• Vertex (physics), a point where particles collide and interact
• Vertex (optics), a point where the optical axis crosses a lens surface
• Vertex algebra in conformal field theory
• Vertex function describing the interaction between a photon and an electron
• Vertex model in statistical mechanics, a discrete model of a physical system in which weights are associated with vertices of a grid graph.

# Wiktionary

Up to date as of January 15, 2010

### Definition from Wiktionary, a free dictionary

Wikipedia has an article on:

Wikipedia

## English

### Etymology

Latin vertex (top, peak), from vertere (to turn)

### Noun

 Singular vertex Plural vertices or vertexes

vertex (plural vertices or vertexes)

1. The highest point of something.
2. (anatomy) The highest surface on the skull.
3. (mathematics)
1. (geometry) Informally; a corner.
1. (angle) The common point of the two rays of the angle.
2. (polygon) The meeting points of two sides.
3. (polyhedron) The meeting point of three or more faces and an equal number of edges.
4. (polytope) a point where the corners of three or more cells meet and connect to each other.
5. (curve) a point on the curve with a local minimum or maximum of curvature.
2. (graph theory) One of the elements of a graph joined by zero or more edges to other vertices.
4. (computer graphics) A point in 3D space, usually given in terms of its x-, y-, and z-coordinates.
5. (optics) The point where the surface of an optical element (e.g. lens) crosses the optical axis.
6. (nuclear or particle physics) the interaction point.
7. (astrology) where the Prime Vertical meets the ecliptic in the west.