Start: go to the homepage U+2100 bis U+214F Letterlike Symbols
Zeichen für U+2140
Quelle: Noto Sans

U+2140 Double-Struck N-Ary Summation

U+2140 wurde in Version 3.2 in 2002 zu Unicode hinzugefügt. Er gehört zum Block U+2100 bis U+214F Letterlike Symbols in der U+0000 bis U+FFFF Basic Multilingual Plane.

Dieses Zeichen ist ein Math Symbol und wird allgemein verwendet, das heißt, in keiner speziellen Schrift.

Das Zeichen ist eine Schriftart Variante des Zeichens Zeichen für U+2211 N-Ary Summation. Es hat keine zugewiesene Weite in ostasiatischen Texten. In bidirektionalem Text handelt es als Other Neutral. Bei einem Richtungswechsel wird es gespiegelt. Das Wort, das U+2140 mit ähnlichen Zeichen bildet, verbietet in sich Zeilenumbrüche. Der Buchstabe kann mit einem anderen Zeichen verwechselt werden.

Die Wikipedia hat die folgende Information zu diesem Codepunkt:

In mathematics, summation is the addition of a sequence of numbers, called addends or summands; the result is their sum or total. Beside numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any type of mathematical objects on which an operation denoted "+" is defined.

Summations of infinite sequences are called series. They involve the concept of limit, and are not considered in this article.

The summation of an explicit sequence is denoted as a succession of additions. For example, summation of [1, 2, 4, 2] is denoted 1 + 2 + 4 + 2, and results in 9, that is, 1 + 2 + 4 + 2 = 9. Because addition is associative and commutative, there is no need of parentheses, and the result is the same irrespective of the order of the summands. Summation of a sequence of only one element results in this element itself. Summation of an empty sequence (a sequence with no elements), by convention, results in 0.

Very often, the elements of a sequence are defined, through a regular pattern, as a function of their place in the sequence. For simple patterns, summation of long sequences may be represented with most summands replaced by ellipses. For example, summation of the first 100 natural numbers may be written as 1 + 2 + 3 + 4 + ⋯ + 99 + 100. Otherwise, summation is denoted by using Σ notation, where is an enlarged capital Greek letter sigma. For example, the sum of the first n natural numbers can be denoted as i=1ni.

For long summations, and summations of variable length (defined with ellipses or Σ notation), it is a common problem to find closed-form expressions for the result. For example,

i=1ni=n(n+1)2.

Although such formulas do not always exist, many summation formulas have been discovered—with some of the most common and elementary ones being listed in the remainder of this article.

Darstellungen

System Darstellung
Nr. 8512
UTF-8 E2 85 80
UTF-16 21 40
UTF-32 00 00 21 40
URL-kodiert %E2%85%80
HTML hex reference ⅀
Falsches windows-1252-Mojibake â…€

Verwandte Schriftzeichen

Verwechselbare

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Vollständiger Eintrag

Eigenschaft Wert
Alter (age) 3.2 (2002)
Unicode-Name (na) DOUBLE-STRUCK N-ARY SUMMATION
Unicode-1-Name (na1)
Block (blk) Letterlike Symbols
Allgemeine Kategorie (gc) Math Symbol
Schrift (sc) Common
Bidirectional Category (bc) Other Neutral
Combining Class (ccc) Not Reordered
Dekompositionstyp (dt) Schriftart
Decomposition Mapping (dm) Zeichen für U+2211 N-Ary Summation
Kleinbuchstabe (Lower)
Simple Lowercase Mapping (slc) Zeichen für U+2140 Double-Struck N-Ary Summation
Lowercase Mapping (lc) Zeichen für U+2140 Double-Struck N-Ary Summation
Großbuchstabe (Upper)
Simple Uppercase Mapping (suc) Zeichen für U+2140 Double-Struck N-Ary Summation
Uppercase Mapping (uc) Zeichen für U+2140 Double-Struck N-Ary Summation
Simple Titlecase Mapping (stc) Zeichen für U+2140 Double-Struck N-Ary Summation
Titlecase Mapping (tc) Zeichen für U+2140 Double-Struck N-Ary Summation
Case Folding (cf) Zeichen für U+2140 Double-Struck N-Ary Summation
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi-Kontrollzeichen (Bidi_C)
Bidi Mirrored (Bidi_M)
Composition Exclusion (CE)
Case Ignorable (CI)
Changes When Casefolded (CWCF)
Changes When Casemapped (CWCM)
Changes When NFKC Casefolded (CWKCF)
Changes When Lowercased (CWL)
Changes When Titlecased (CWT)
Changes When Uppercased (CWU)
Cased (Cased)
Full Composition Exclusion (Comp_Ex)
Default Ignorable Code Point (DI)
Dash (Dash)
Veraltet (Dep)
Diakritisch (Dia)
Emoji Modifier Base (EBase)
Emoji Component (EComp)
Emoji Modifier (EMod)
Emoji-Darstellung (EPres)
Emoji (Emoji)
Extender (Ext)
Extended Pictographic (ExtPict)
FC NFKC Closure (FC_NFKC) Zeichen für U+2140 Double-Struck N-Ary Summation
Grapheme Cluster Break (GCB) Egal
Grapheme Base (Gr_Base)
Grapheme Extend (Gr_Ext)
Grapheme Link (Gr_Link)
Hex Digit (Hex)
Hyphen (Hyphen)
ID Continue (IDC)
ID-Start (IDS)
IDS Binary Operator (IDSB)
IDS Trinary Operator and (IDST)
IDSU (IDSU) 0
ID_Compat_Math_Continue (ID_Compat_Math_Continue) 0
ID_Compat_Math_Start (ID_Compat_Math_Start) 0
Ideogramm (Ideo)
InCB (InCB) None
Indic Mantra Category (InMC)
Indic Positional Category (InPC) NA
Indic Syllabic Category (InSC) Other
Jamo Short Name (JSN)
Verbindungskontrollzeichen (Join_C)
Logische Reihenfolgenausnahme (LOE)
Math (Math)
Nicht-Zeichen-Codepunkt (NChar)
NFC Quick Check (NFC_QC) Ja
NFD Quick Check (NFD_QC) Ja
NFKC Casefold (NFKC_CF) Zeichen für U+2211 N-Ary Summation
NFKC Quick Check (NFKC_QC) Nein
NFKC_SCF (NFKC_SCF) Zeichen für U+2211 N-Ary Summation
NFKD Quick Check (NFKD_QC) Nein
Other Alphabetic (OAlpha)
Other Default Ignorable Code Point (ODI)
Other Grapheme Extend (OGr_Ext)
Other ID Continue (OIDC)
Other ID Start (OIDS)
Other Lowercase (OLower)
Other Math (OMath)
Other Uppercase (OUpper)
Prepended Concatenation Mark (PCM)
Pattern Syntax (Pat_Syn)
Pattern White Space (Pat_WS)
Quotation Mark (QMark)
Regional Indicator (RI)
Radical (Radical)
Sentence Break (SB) Andere
Soft Dotted (SD)
Sentence Terminal (STerm)
Terminal Punctuation (Term)
Unified Ideograph (UIdeo)
Variation Selector (VS)
Word Break (WB) Andere
White Space (WSpace)
XID Continue (XIDC)
XID-Start (XIDS)
Expands On NFC (XO_NFC)
Expands On NFD (XO_NFD)
Expands On NFKC (XO_NFKC)
Expands On NFKD (XO_NFKD)
Bidi Paired Bracket (bpb) Zeichen für U+2140 Double-Struck N-Ary Summation
Bidi Paired Bracket Type (bpt) None
Ostasiatische Weite (ea) neutral
Hangul Syllable Type (hst) Nicht anwendbar
ISO 10646 Comment (isc)
Joining Group (jg) No_Joining_Group
Joining Type (jt) Non Joining
Line Break (lb) Alphabetic
Numerischer Typ (nt) none
Numerischer Wert (nv) keine Nummer
Simple Case Folding (scf) Zeichen für U+2140 Double-Struck N-Ary Summation
Schrifterweiterung (scx)
Vertical Orientation (vo) R