Necessary and sufficient conditions
In science, the terms necessary and sufficient are often used. Some conditions are necessary, meaning that they are needed for something to happen. while others are sufficient, meaning that they are enough to make something happen.
A sufficient condition for a statement is a logical precursor of the statement, in the sense that if the condition is true, then so will the statement.
Mixed use of necessity and sufficiencyEdit
Generally, a sufficient condition for a statement needs not be a necessary condition for the same statement (and vice versa). This means that some sufficient conditions are not necessary, and that some necessary conditions are not sufficient.
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- Swartz, Norman. "The Concepts of Necessary Conditions and Sufficient Conditions". sfu.ca. Retrieved October 8, 2020.
- Brennan, Andrew (2017). Zalta, Edward N. (ed.). The Stanford Encyclopedia of Philosophy (Summer 2017 ed.). Metaphysics Research Lab, Stanford University.