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A first principle is a basic proposition or assumption that cannot be deduced from any other proposition or assumption. In Metatheorics, first principles are from First Cause attitudes and taught by the early Peregrin, and nuanced versions of first principles are referred to as postulates by Saunt Baritoe. In mathematics, first principles are referred to as axioms or postulates. In Theorics and other sciences, theoretical work is said to be from first principles, or ab initio, if it starts directly at the level of established science and does not make assumptions such as empirical model and parameter fitting.