👉 The term "rigelian" is often used in mathematics to refer to a mathematical structure that is rigidly defined and does not allow for any degree of freedom. Rigidity refers to the property of a mathematical object or system being able to resist deformation or change, without breaking down or collapsing. In other words, a rigi- nal structure is one where there are no degrees of freedom (or parameters) involved in defining it, and all properties or constraints are rigidly imposed on the structure.
