Bravais lattice

A three-dimensional Bravais lattice iswhere the primitive vectors $a_1,a_2,a_3$ are linearly independent.

A Bravais lattice is a concept in crystallography that describes a specific arrangement of points in space, which represents the periodic repetition of a motif in three-dimensional space. It is defined by a set of discrete points that are arranged in a pattern that repeats at regular intervals, effectively forming the basis for the structure of a crystalline solid.