Representation of vectors:

Algebraic representation:

General printing is represented by lowercase English letters (a, b, c, etc.). ) bold, while handwriting is represented by adding an arrow (→) to letters such as A, B and C, for example, it can also be represented by adding an arrow (→) to capital letters AB and CD.

Geometric representation:

A vector can be represented by a directed line segment. The length of the directed line segment indicates the size of the vector, the size of the vector, that is, the length of the vector.

A vector of length 0 is called a zero vector, and a vector of length 1 unit is called a unit vector. The direction indicated by the arrow indicates the direction of the vector.

In mathematics, vectors (also known as Euclidean vectors, geometric vectors and vectors) refer to quantities with magnitude and direction. It can be imagined as a line segment with an arrow. The arrow indicates the direction of the vector; Line segment length: indicates the size of the vector. The quantity corresponding to a vector is called a quantity (called a scalar in physics), and a quantity (or scalar) has only a size and no direction.