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In optics the Lagrange invariant is a measure of the light propagating through an optical system. It is defined by = ¯ ¯, where y and u are the marginal ray height and angle respectively, and ȳ and Å« are the chief ray height and angle.
About 1/8 wavelength long: (left) 200 MHz stub is 19 cm, (right) 300 MHz stub is 12.5 cm 10 kW FM broadcast transmitter from 1947 showing quarter-wave resonant stub plate tank circuit. In microwave and radio-frequency engineering, a stub or resonant stub is a length of transmission line or waveguide that is connected at one end only. The free ...
In linear algebra, an n-by-n square matrix A is called invertible (also nonsingular, nondegenerate or rarely regular) if there exists an n-by-n square matrix B such that = =, where I n denotes the n-by-n identity matrix and the multiplication used is ordinary matrix multiplication. [1]
The glenopolar angle (GPA) is a measure for the rotational malalignment of the glenoid about an anteroposterior (front-to-back) axis perpendicular to the scapular plane.. The glenopolar angle is defined as the angle between the line connecting the most cranial with the most caudal point of the glenoid cavity and the line connecting the most cranial of the glenoid cavity with the most caudal ...
The HP-22S includes many of the typical features found in most scientific calculators: Trigonometric and hyperbolic functions; Polar/rectangular coordinate conversion; Probability functions and statistical calculators (mean and standard deviation, weighted mean, linear regression) Unit and base conversions
George Lane (born 1964) is a British mental calculator and author. He is a five-time gold medalist in the Mental Calculations event at the annual Mind Sports Olympiad , [1] [2] and is one of only five Grandmasters of Mental Calculation, [3] as recognised by the Mind Sports Organisation .
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