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请输入英文单字，中文词皆可：

0    
0
adj 1: indicating the absence of any or all units under
consideration; "a zero score" [synonym: {zero}, {0}]
n 1: a mathematical element that when added to another number
yields the same number [synonym: {zero}, {0}, {nought},
{cipher}, {cypher}]

A dictionary containing a natural history requires too
many hands, as well as too much time, ever to be hoped
for. --Locke.
0 \0\ adj.
1. indicating the absence of any or all units under
consideration; -- representing the number zero as an
Arabic numeral.

Syn: zero
[WordNet 1.5 PJC]

{zero}

0 Numeric zero, as opposed to the letter ‘O’ (the 15th
letter of the English alphabet). In their unmodified forms they look a lot
alike, and various kluges invented to make them visually distinct have
compounded the confusion. If your zero is center-dotted and letter-O is
not, or if letter-O looks almost rectangular but zero looks more like an
American football stood on end (or the reverse), you're probably looking at
a modern character display (though the dotted zero seems to have originated
as an option on IBM 3270 controllers). If your zero is slashed but
letter-O is not, you're probably looking at an old-style ASCII graphic set
descended from the default typewheel on the venerable ASR-33 Teletype
(Scandinavians, for whom Ø is a letter, curse this arrangement).
(Interestingly, the slashed zero long predates computers; Florian Cajori's
monumental A History of Mathematical Notations notes
that it was used in the twelfth and thirteenth centuries.) If letter-O has
a slash across it and the zero does not, your display is tuned for a very
old convention used at IBM and a few other early mainframe makers
(Scandinavians curse this arrangement even more,
because it means two of their letters collide). Some Burroughs/Unisys
equipment displays a zero with a reversed slash. Old
CDC computers rendered letter O as an unbroken oval and 0 as an oval broken
at upper right and lower left. And yet another convention common on early
line printers left zero unornamented but added a tail or hook to the
letter-O so that it resembled an inverted Q or cursive capital letter-O
(this was endorsed by a draft ANSI standard for how to draw ASCII
characters, but the final standard changed the distinguisher to a tick-mark
in the upper-left corner). Are we sufficiently confused yet?


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  • 0 - Wikipedia
    0 (zero) is a number representing an empty quantity Adding (or subtracting) 0 to any number leaves that number unchanged; in mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures
  • What is Zero in Math? Definition, Facts, and Examples
    Zero is the number that represents no amount or no objects The numbers 1, 2, 3, and onwards are called natural numbers Zero and the natural numbers together are called whole number s Zero is represented by the symbol “0 ” If you’re wondering what is zero in math, you might also be wondering, is zero a real number in math? Yes!
  • 0 - Simple English Wikipedia, the free encyclopedia
    0 is the integer that precedes the positive 1, and follows −1 In most numerical systems, 0 was identified before the idea of "negative integers" was accepted
  • Zero - Math is Fun
    Zero is a very special number It is halfway between −1 and +1 on the Number Line: Zero is neither negative nor positive But it is an even number The idea of zero, though natural to us now, was not natural to early humans if there is nothing to count, how can we count it? Example: you can count dogs, but you can't count an empty space:
  • 0 (number) - New World Encyclopedia
    0 is the integer that precedes the positive 1, and follows −1 In most (if not all) numerical systems, 0 was identified before the idea of 'negative integers' was accepted
  • The Number 0: What It Is and How to Use It - PrepScholar
    The number 0 in today’s math can be tricky; why calculate something when there’s not actually anything there? But zero can be used in a variety of math problems, and it’s important to know what to do with zero when you see it
  • Zero Number (0) - RapidTables. com
    Zero is a number used in mathematics to describe no quantity or null quantity When there are 2 apples on the table and we take the 2 apples, we can say that there are zero apples on the table The zero number is not positive number and not negative number The zero is also a placeholder digit in other numbers (e g: 40,103, 170) Is zero a number?
  • Zero -- from Wolfram MathWorld
    Zero is the integer denoted 0 that, when used as a counting number, means that no objects are present It is the only integer (and, in fact, the only real number) that is neither negative nor positive
  • The Origin of Zero - Scientific American
    "There are at least two discoveries, or inventions, of zero," says Charles Seife, author of Zero: The Biography of a Dangerous Idea (Viking, 2000) "The one that we got the zero from came from
  • The Origins of the Zero | Encyclopedia. com
    Today we use a descendant of the Hindu zero, which had a long journey and encountered much resistance until finally accepted in the West Before any invention can be made and accepted in a society, there has to be a need





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