👉 The term "ruelle" is a mathematical concept that refers to a type of non-linear system in physics and mathematics known as a quantum field theory. It describes a phenomenon where quantum fluctuations (quantum mechanical disturbances) are not well described by classical mechanics, but instead by an unconventional behavior called the Ruelle transform. In this context, "ruelle" is often used as a synonym for the term "quasi-one". The quasi-one in this context refers to a quantity that appears to be
