👉 The term "reft" is a term used in mathematics and physics. It stands for "relativistic free particle." In relativistic mechanics, a particle with mass m and rest mass m0 (where m0 > m) can be described as having a momentum p = mv/m0. This momentum p is called the relativistic momentum of the particle. The term "reft" refers to the relativistic free particle model, which describes how this relativistic momentum behaves under the effect
