prove the intersction for crisp set theory
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Descartes created the most popular theory on planetary motion. He also contributed to the theories and laws of motion as well as the laws of nature.
Postulating in mathematics is simply stating stating or assuming something, usually an equation, to be true without having to prove it. This aids in the development of new mathematical theories. Commonly used postulates are Einsteins theories and his laws of the physics.
Newton influenced mathematical thinking by his theory of Gravity, in using his mathematical analysis to derive Keplers Laws, mathematically. In addition his book "Principia" also influenced mathematical thinking, especially the invention of Calculus .
The laws that let you remove or introduce parentheses in logic expressions."not (a and b)" is the same as "not a or not b" and: "not (a or b)" is the same as "not a and not b" Similar in set theory, with union versus intersection. For more details, check the Wikipedia article "De Morgan's law".
There are 17 Laws in the FIFA Laws of the Game.