A porism is a mathematical proposition or corollary. It has been used to refer to a direct consequence of a proof, analogous to how a corollary refers to a direct consequence of a theorem. In modern usage, it is a relationship that holds for an infinite range of values but only if a certain condition is assumed, such as Steiner's porism.[1] The term originates from three books of Euclid that have been lost. A proposition may not have been proven, so a porism may not be a theorem or true.
^Eves, Howard W. (1995). College geometry. p. 138. ISBN 0867204753.
Steiner's porism. The term originates from three books of Euclid that have been lost. A proposition may not have been proven, so a porism may not be...
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discovered many of their properties. A fundamental result is Steiner's porism, which states: If at least one closed Steiner chain of n circles exists...
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