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13432 | The essence of a circle is the equality of its radii [Leibniz] |
Full Idea: The essence of a circle consists in the equality of all lines drawn from its centre to its circumference. | |
From: Gottfried Leibniz (Letters to Thomasius [1669], 1669) | |
A reaction: Compare Locke in Idea 13431 and Spinoza in Idea 13073 on the essence of geometrical figures. A key question is whether the essence is in the simplest definition, or in a complex and wide-ranging account, e.g. including conic sections for circles. |