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Diagram showing the cumulative distribution function for the normal distribution with mean (μ) 0 and variance (σ 2) 1. These numerical values "68%, 95%, 99.7%" come from the cumulative distribution function of the normal distribution.
John Thompson Dorrance (1873–1930), U.S. – Condensed soup Amanda Minnie Douglas (1831–1916) – writer and inventor (portable folding mosquito net frame) Charles Dow (1851–1902), U.S. – Dow Jones Industrial Average
This subscripted notation, which is endorsed in official SI literature, [11] has the same form as related electromagnetic constants: namely, μ 0 for the vacuum permeability or magnetic constant, ε 0 for the vacuum permittivity or electric constant, and Z 0 for the impedance of free space. This article uses c exclusively for the speed of light ...
The name comes from the Russian word перо (pero) meaning feather, reflecting the form of pernach that resembled an arrow with fletching. The most popular variety of pernach had six flanges and was called shestopyor (from Russian shest ' and pero, that is six-feathered). Pernach was the first form of the flanged mace to find wide usage.