As opposed to traditional mathematical models and equations, the equality free model theory is aimed at examining mathematical formulas that do not have equalities based on algebra logic. This can also be referred to as first order logic without equality. In the language, there are two structures. We can interpret these structures in an alternative manner in first order logic. When this structure is used, the term normal model is used to refer to two individuals that exist. If these two items A,* and B* are present and they do not satisfy the equation A,* ≅B* , the term normal Continue reading...