👉 Dissis (δ) or discept (χ), in mathematics, is a mathematical concept used to describe the property of an object to be different from another object. This concept is often used in physics and engineering to describe how an object behaves when subjected to forces that are not uniform across its surface. In physics, dissis refers to the ability of an object to resist or withstand changes in its environment due to external forces such as gravity, temperature, pressure, or other physical conditions. This