PORISM

Etymology

Noun

porism (plural porisms)

(geometry, number theory) A proposition affirming the possibility of finding such conditions as will render a certain determinate problem indeterminate or capable of innumerable solutions.

A corollary.

A Porism is a proposition in which it is proposed to demonstrate that some one thing, or more things than one, are given, to which, as also to each of innumerable other things, not given indeed, but which have the same relation to those which are given, it is to be shewn that there belongs some common affection described in the proposition.

Anagrams

• impros, primos

Source: Wiktionary

Po"rism, n. Etym: [Gr. porisme.]

1. (Geom.)

Definition: A proposition affirming the possibility of finding such conditions as will render a certain determinate problem indeterminate or capable of innumerable solutions. Playfair.

2. (Gr. Geom.)

Definition: A corollary. Brande & C.

Note: Three books of porisms of Euclid have been lost, but several attempts to determine the nature of these propositions and to restore them have been made by modern geometers.

Source: Webster’s Unabridged Dictionary 1913 Edition

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