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The following 2 entries include the term euler's.
Euler's equation
noun: an equation in alternating-current theory: eix=cos x+i sin x
Euler's formula
noun: a general engineering formula relating to the strength of a long strut and obtained by mathematical analysis assuming the strut to be initially very slightly bent and neglecting the (dy/dx)2 term in the curvature equation: P = cπ2EI/l2, where P = axial load, E = Young's modulus, I = moment of inertia of transverse section of strut, l = length of strut, and c = a constant depending upon the manner of fixing the ends
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Merriam-Webster unabridged
