Napier's Inequality (I)
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Napier's inequality: If , then .[more]
Observe that in the graphic, , the slope of the secant line passing through and , is between the slopes of the tangent lines at and .[less]
Contributed by: Soledad Mª Sáez Martínez and Félix Martínez de la Rosa (March 2011)
Open content licensed under CC BY-NC-SA
Reference: R. Nelsen, "Napier's Inequality (Two Proofs)," The College Mathematics Journal, 24(2), 1993 p. 165.