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Author
Series
Publisher
Dover Publications
Pub. Date
2021
Language
English
Description
Can you multiply 362 x .5 quickly in your head? Could you readily calculate the square of 41? How much is 635 divided by 2½? Can 727,648 be evenly divided by 8? If any of these questions took you more than a few seconds to solve, you need this book. Short-Cut Math is a concise, remarkably clear compendium of about 150 math short-cuts - timesaving tricks that provide faster, easier ways to add, subtract, multiply, and divide. By using the simple foolproof...
2) Geometries
Author
Series
Description
In the present text, we present a brief introduction to non-Euclidean geometries. We begin by presenting the foundations of classical geometry, and the discussion that gave rise to other geometries. There is an incredibly old example of an attempt to demonstrate the fifth postulate of Euclid due to Proclus, and part of Sacheri's work is retaken, to continue later with the achievements of Lobachevsky. In simple terms, the geometry to which we are accustomed,...
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