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G. H. Hardy, A Mathematician's Apology (1940) He [Russell] said once, after some contact with the Chinese language, that he was horrified to find that the language of Principia Mathematica was an Indo-European one. John Edensor Littlewood, Littlewood's Miscellany (1986) The Principia Mathematica (often abbreviated PM) is a three-volume work on the foundations of mathematics written by ...
Square root. Notation for the (principal) square root of x. For example, √ 25 = 5, since 25 = 5 ⋅ 5, or 52 (5 squared). In mathematics, a square root of a number x is a number y such that ; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. [1] For example, 4 and −4 are square roots of 16 ...
The orange sheet in the middle is the principal sheet representing arctan x. The blue sheet above and green sheet below are displaced by 2 π and −2 π respectively. Since the inverse trigonometric functions are analytic functions , they can be extended from the real line to the complex plane.
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US$ 16.125 Billion (Fiscal Year Ended December 31, 2021) [1] Number of employees. ~18,600 (As of December 31, 2022) [1] Subsidiaries. Principal Mutual Fund. Website. principal .com. Principal Financial Group is an American global financial investment management and insurance company headquartered in Des Moines, Iowa, U.S.
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Cardinal point (optics) In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system. These are the focal points, the principal points, and the nodal points; there are two of each. [1] For ideal systems, the basic imaging properties such as image size ...
t. e. An interest rate is the amount of interest due per period, as a proportion of the amount lent, deposited, or borrowed (called the principal sum ). The total interest on an amount lent or borrowed depends on the principal sum, the interest rate, the compounding frequency, and the length of time over which it is lent, deposited, or borrowed.