real numbers wikipedia - EAS
- Real number From Simple English Wikipedia, the free encyclopedia A real number is a rational or irrational number, and is a number which can be expressed using decimal expansion. Usually when people say "number", they usually mean "real number". The official symbol for real numbers is a bold R, or a blackboard boldsimple.wikipedia.org/wiki/Real_number
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https://en.wikipedia.org/wiki/Real_numberIn mathematics, a real number is a value of a continuous quantity that can represent a distance along a line (or alternatively, a quantity that can be represented as an infinite decimal expansion). The adjective real in this context was introduced in the 17th century by René Descartes, who distinguished
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Xem thêmSimple fractions were used by the Egyptians around 1000 BC; the Vedic "Shulba Sutras" ("The rules of chords") in c. 600 BC include what may be the first "use" of irrational numbers. The concept of irrationality was implicitly
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Xem thêmThe real number system can be defined axiomatically up to an isomorphism, which is described hereafter. There are also many ways to construct "the" real number system, and a popular
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Xem thêmBasic properties
• Any non-zero real number is either negative or positive.
• The sum and the product of two non-negative real numbers is again a non-negative real number, i.e., they are closed under these operations, and form a positive cone,...
Xem thêmReal numbers and logic
The real numbers are most often formalized using the Zermelo–Fraenkelaxiomatization of set theory, but some mathematicians study the...
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The real numbers can be generalized and extended in several different directions:
• The complex numbers contain solutions to all polynomial...
Xem thêmMathematicians use the symbol R, or, alternatively, , the letter "R" in blackboard bold (encoded in Unicode as U+211D ℝ DOUBLE-STRUCK CAPITAL R (HTML ℝ · ℝ, ℝ)), to represent the setof all real numbers. As this set is naturally
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Xem thêmVăn bản Wikipedia theo giấy phép CC-BY-SAMục này có hữu ích không?Cảm ơn! Cung cấp thêm phản hồiReal number - Simple English Wikipedia, the free encyclopedia
https://simple.wikipedia.org/wiki/Real_numberJump to navigation Jump to search. A real number is a rational or irrational number, and is a number which can be expressed using decimal expansion. Usually when people say "number", they usually mean "real number". The official symbol for real numbers is a bold R, or a blackboard bold. R {\displaystyle \mathbb {R} }
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Construction of the real numbers - Wikipedia
https://en.wikipedia.org/wiki/Construction_of_the_real_numbersIn mathematics, there are several equivalent ways of defining the real numbers. One of them is that they form a complete ordered field that does not contain any smaller complete ordered field. Such a definition does not prove that such a complete ordered field exists, and the existence proof consists to construct a mathematical structure that satisfies the definition.
The article presents several such constructions. They are equivalent in the sense that, given the …Wikipedia · Nội dung trong CC-BY-SA giấy phépSố phức – Wikipedia tiếng Việt
https://vi.wikipedia.org/wiki/Số_phức- Nhà toán học người Ý R. Bombelli (1526-1573) đã đưa định nghĩa đầu tiên về số phức, lúc đó được gọi là số "không thể có" hoặc "số ảo" trong công trình Đại số (Bologne, 1572) công bố ít lâu trước khi ông mất. Ông đã định nghĩa các số đó (số phức) khi nghiên cứu các phương trình bậc ba và đã đưa ra căn bậc hai của − 1 {\displaystyle -1} . Nhà toán học người Pháp D’Alembert và…
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