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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. The prediction interval for any standard score z corresponds numerically to (1 − (1 − Φ μ,σ 2 (z)) · 2).
These include the equivalence of mass and energy (E = mc 2), length contraction (moving objects shorten), [Note 8] and time dilation (moving clocks run more slowly). The factor γ by which lengths contract and times dilate is known as the Lorentz factor and is given by γ = (1 − v 2 / c 2 ) −1/2 , where v is the speed of the object.
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
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.