Segol Segol Segol ( ) is a Hebrew niqqud vowel sign that is represented by three dots forming an upside down equilateral triangle "ֶ ". As such, it resembles an upside down therefore sign (a because sign) underneath a letter. In modern Hebrew, it indicates the phoneme which is similar to "e" in the English word sound in "sell" and is transliterated as an "e". In Modern Hebrew, segol does the Hataf Segol ( , "Reduced Segol"). The reduced (or "ħataf") niqqud exist for segol, patah, and kamatz which contain a shva next to it. The following table contains the pronunciation
Three-body problem effective potential. In 1767, Leonhard Euler found three families of periodic solutions in which the three masses are collinear at each instant. In 1772, Lagrange found a family of solutions in which the three masses form an equilateral triangle at each instant. Together, these solutions form the "central configurations" for the three-body problem. These solutions are valid for any mass ratios, and the masses move on Keplerian ellipses. These four families are the only known solutions for which there are explicit analytic formulae. In the special case of the circular restricted three-body problem, these solutions, viewed in a frame rotating