A Course of Mathematics, Vol. 1 of 2: For the Use of Academies as Well as Private Tuition (Classic Reprint)

Excerpt from A Course of Mathematics, Vol. 1 of 2: For the Use of Academies as Well as Private Tuition

6. A Theorem is a demonstrative Proposition; in which some property is asserted, and the truth of it required to be proved. Thus, when it is said that, The sum of the three an les of a plane triangle is equal to two right angles, that is a boorom, the truth of which is demonstrated by Geometry. - A set or collection of such Theorems constitutes a Theory.

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