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Sign (mathematics) - Wikipedia, the free encyclopedia
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Sign (mathematics)
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The
plus and minus symbols are used to show the sign of a number.
Not to be confused with the
sine function in trigonometry.
In
mathematics, the word sign refers to the property of being positive or
negative. Every nonzero
real number is either positive or negative, and therefore has a sign.
Zero itself is signless, although in some contexts it makes sense to consider a
signed zero. In addition to its application to real numbers, the word sign is used throughout mathematics to indicate aspects of mathematical objects that resemble positivity and negativity, such as the
sign of a permutation.
The word sign is also sometimes used to refer to various mathematical
symbols, such as the
plus and minus symbols and the
multiplication symbol. See the
table of mathematical symbols for more information on signs and symbols in mathematics.
Contents
Sign of a number
A
real number is said to be positive if it is
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