To arrive at a good and mathematically correct definition there are four principles to serve as guides. Without these principles one can be lost in the dense forest of mathematical reasoning forever searching for certain plausible mathematical truths. The first principle requires that all terms in a definition must be predefined or stay undefined by agreement as mathematical assumptions called axioms or postulates. The second states that the term being defined should be situated in the next larger set or class to which it belongs. The third says that the defining term must be distinguished from all other members of its class. Finally, the fourth principle requires that the distinguishing characteristics of a defined term should be as few as possible.
These principles are strictly followed by the science of biology for the classification of all living things whether plants or animals. For example, as a simple test and observing the proper sequence in definition, in which order should the terms in this set of living things be defined: American, Austinian, earthling, animals, Texan, human, North American.


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