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Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration camp.
The MF 19 (Métro Fer appel d'offres 2019; 2019 procurement rail metro) is a class of rolling stock being built for the Paris Métro. It was ordered to replace existing trains on Lines 3, 3bis, 7, 7bis, 8, 10, 12 and 13, starting in 2025. It is being built by Alstom. Lines 3bis and 7bis will use 4-car trains, an upgrade from the current 3-car sets.
Alan Woods (1945 – 26 January 2008) was an Australian and Hong Kong professional gambler and mathematician considered among the biggest gamblers in the world. Woods focused on blackjack and betting on horse racing. He has worked with Bill Benter and Zeljko Ranogajec during his career and "pioneered quantitative gambling by betting on Hong ...
A rocket's required mass ratio as a function of effective exhaust velocity ratio. The classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity and can thereby move due to the ...
In mathematics, specifically group theory, the free product is an operation that takes two groups G and H and constructs a new group G ∗ H. The result contains both G and H as subgroups, is generated by the elements of these subgroups, and is the “universal” group having these properties, in the sense that any two homomorphisms from G and H into a group K factor uniquely through a ...
ISBN 978-81-209-1421-6. Brahmagupta is believed to have composed many important works of mathematics and astronomy. However, two of his most important works are: Brahmasphutasiddhanta (BSS) written in 628 AD, and the Khandakhadyaka... ^ Miodrag Petković (2009). Famous puzzles of great mathematicians.
Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...
Escape time algorithm. The simplest algorithm for generating a representation of the Mandelbrot set is known as the "escape time" algorithm. A repeating calculation is performed for each x, y point in the plot area and based on the behavior of that calculation, a color is chosen for that pixel.