from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. Formula which links complex exponentiation with trigonometric functions:
- proper n. Formula which calculates the normal curvature of an arbitrary direction in the tangent plane in terms of the principal curvatures and and the angle which that direction makes with the first principal direction:
Named after the 18th century Swiss mathematician Leonhard Euler (1707-1783). (Wiktionary)
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