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5 days ago · Preface. This secton is devoted to one of the most important differential equations--- Bessel equation. Its solutions were named for Friedrich Wilhelm Bessel (1784--1846); however, Daniel Bernoulli is generally credited with being the first to introduce the concept of Bessels functions in 1732.
3 days ago · Introduction to Linear Algebra with Mathematica. Glossary. Preface. In this section, we show that Bessel's functions. ϕn(x) = Jν(μnx ℓ) (n = 1, 2, 3, …) are orthogonal when parameters μ n are positive roots of some transcendent equation involving Bessel functions of the first kind. Orthogonal means that.
1 day ago · In fact, the first measurement of parallax was possible only in 1839 by Friedrich Bessel. In the seventeenth century, Kepler suggested a clever way of testing the heliocentric theory. He argued that two stars which appear to be very close in the sky are, except in very rare cases, must be actually far away from each other.
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16 hours ago · Betelgeuse, α Ori, 58 Ori, HR 2061, BD +7°1055, HD 39801, FK5 224, HIP 27989, SAO 113271, GC 7451, CCDM J05552+0724, AAVSO 0549+07. Database references. SIMBAD. data. Betelgeuse is a red supergiant star in the constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second-brightest in its ...
5 days ago · Introduction to Linear Algebra with Mathematica. Glossary. Preface. This section presents some famous expansions involving Bessel functions of the first kind, commonly denoted by Jν ( x ). There are several variations of these expansions and all of them are very important in applications.
16 hours ago · The selection process for the Bessel Award is a multi-stage procedure. Firstly, established researchers in Germany submit a nomination whereby it is not the Humboldt Foundation that decides who should receive awards and fellowships but selection committees – in the case of the Bessel Award consisting of 23 academics from various disciplines.
3 days ago · The full set of rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini orbiter, 1.2 million km (¾ million miles) distant, on 19 July 2013 (brightness is exaggerated). Earth appears as a dot at 4 o'clock, between the G and E rings. The rings of Saturn are the most extensive and complex ring system of any planet in the Solar ...
