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5 lines
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5 lines
848 B
Plaintext
The set of real numbers ℝ can be best understood as all the finite and infinite decimal fractions. ℝ is the first known uncountable set. The term "real" comes from the Latin word "realis," meaning "actual" or "real."
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By the 3rd century, it became clear that rational numbers were not sufficient for representing distances in geometry. A comprehensive theory of real numbers emerged in the 19th century with the development of mathematical analysis.
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The sets [U:2115], [U:2124], [U:211A], [U:211D], [U:2102] are often written in bold font (for example, in the works of Nicolas Bourbaki) or as double-struck letters on blackboards and manuscripts. American mathematicians introduced the usage of double-struck font in printed texts, and it became popularized with the famous textbook on complex analysis by Gunning and Rossi, published in 1965. |