U+2115 Double-Struck Capital N
U+2115 was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Uppercase Letter and is commonly used, that is, in no specific script. Znak jest również znany jako natural number.
The glyph is a font version of the glyph
Wikipedia ma następujące informacje na temat tej współrzędnej kodowej:
In mathematics, the natural numbers are the numbers 1, 2, 3, etc., possibly including 0 as well.[under discussion] Some definitions, including the standard ISO 80000-2, begin the natural numbers with 0, corresponding to the non-negative integers 0, 1, 2, 3, ..., whereas others start with 1, corresponding to the positive integers 1, 2, 3, ... Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). In common language, particularly in primary school education, natural numbers may be called counting numbers to intuitively exclude the negative integers and zero, and also to contrast the discreteness of counting to the continuity of measurement—a hallmark characteristic of real numbers.
The natural numbers can be used for counting (as in "there are six coins on the table"), in which case they serve as cardinal numbers. They may also be used for ordering (as in "this is the third largest city in the country"), in which case they serve as ordinal numbers. Natural numbers are sometimes used as labels—also known as nominal numbers, (e.g. jersey numbers in sports)—which do not have the properties of numbers in a mathematical sense.
The natural numbers form a set, often symbolized as . Many other number sets are built by successively extending the set of natural numbers: the integers, by including an additive identity 0 (if not yet in) and an additive inverse −n for each nonzero natural number n; the rational numbers, by including a multiplicative inverse for each nonzero integer n (and also the product of these inverses by integers); the real numbers by including the limits of Cauchy sequences of rationals; the complex numbers, by adjoining to the real numbers a square root of −1 (and also the sums and products thereof); and so on. This chain of extensions canonically embeds the natural numbers in the other number systems.
Properties of the natural numbers, such as divisibility and the distribution of prime numbers, are studied in number theory. Problems concerning counting and ordering, such as partitioning and enumerations, are studied in combinatorics.
Reprezentacje
System | Reprezentacje |
---|---|
Nº | 8469 |
UTF-8 | E2 84 95 |
UTF-16 | 21 15 |
UTF-32 | 00 00 21 15 |
Adres URL cytowany | %E2%84%95 |
HTML hex reference | ℕ |
Błędne windows-1252 Mojibake | â„• |
HTML named entity | ℕ |
HTML named entity | ℕ |
alias | natural number |
LATEX | \mathbb{N} |
Powiązane znaki
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Kompletny opis
Właściwość | Wartość |
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1.1 (1993) | |
DOUBLE-STRUCK CAPITAL N | |
DOUBLE-STRUCK N | |
Letterlike Symbols | |
Uppercase Letter | |
Common | |
Left To Right | |
Not Reordered | |
font | |
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✘ | |
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✔ | |
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✘ | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✔ | |
✘ | |
✘ | |
✘ | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
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Any | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
✔ | |
✔ | |
✘ | |
✘ | |
0 | |
0 | |
0 | |
✘ | |
None | |
— | |
NA | |
Other | |
— | |
✘ | |
✘ | |
✔ | |
✘ | |
Yes | |
Yes | |
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No | |
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No | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
Upper | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
Alphabetic Letter | |
✘ | |
✔ | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
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None | |
neutral | |
Not Applicable | |
— | |
No_Joining_Group | |
Non Joining | |
Alphabetic | |
none | |
not a number | |
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R |