In mathematics, physics, and engineering, a Euclidean vector (sometimes called a geometric or spatial vector, or simply a vector) is a geometric object that has magnitude (or length) and direction and can be added to other vectors according to vector algebra. A Euclidean vector is frequently represented by a line segment with a definite direction, or graphically as an arrow, connecting an initial point A with a terminal point B, and denoted by
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- Physics deals with a great many quantities that have both size and direction, and it needs a special mathematical language —the language of vectors —to describe those quantities. This language is also used in engineering, the other sciences, and even in common speech.
- Jearl Walker, David Halliday, and Robert Resnick, Fundamentals of Physics (10th ed., 2014), Ch. 3. Vectors