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Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of ... 40 and 400 (IV, XL and CD) ... [73] In photography, Roman ...
A form of unary notation called Church encoding is used to represent numbers within lambda calculus. Some email spam filters tag messages with a number of asterisks in an e-mail header such as X-Spam-Bar or X-SPAM-LEVEL. The larger the number, the more likely the email is considered spam. 10: Bijective base-10: To avoid zero: 26: Bijective base-26
Numbers may either precede or follow their noun (see Latin word order). Most numbers are invariable and do not change their endings: regnāvit Ancus annōs quattuor et vīgintī (Livy) [1] 'Ancus reigned for 24 years' However, the numbers 1, 2, 3, and 200, 300, etc. change their endings for gender and grammatical case.
Where 73 is the ninth member of Hogben's central polygonal numbers, which enumerates the maximal number of interior regions formed by nine intersecting circles, [8] members in this sequence also include 307, 343, and 703 as the 18th, 19th, and 27th indexed numbers, respectively (where 18 + 19 = 37); while 3, 7 and 21 are also in this sequence ...
Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.
The number the numeral represents is called its value. Not all number systems can represent the same set of numbers; for example, Roman numerals cannot represent the number zero. Ideally, a numeral system will: Represent a useful set of numbers (e.g. all integers, or rational numbers)
Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI The name of a chemical element may be used to signify its symbol; e.g., W for tungsten The days of the week; e.g., TH for Thursday
Ancient Aramaic alphabets had enough letters to reach up to 9000. In mathematical and astronomical manuscripts, other methods were used to represent larger numbers. Roman numerals and Attic numerals, both of which were also alphabetic numeral systems, became more concise over time, but required their users to be familiar with many more signs.