A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
The number 2 is the second natural number, after 1. Each natural number, including 2, is constructed by succession, that is, by adding 1 to the previous natural number.
2是一个自然数，同时也是1和3之间的正整数，也是偶数。 2是最小的质数（也叫素数），也是唯一的偶质数，只有1、2两个因数，是一个有理数。 2也是黑格纳数。 如果一个数能被2整除，就是偶数，反之则是奇数。
The glyph currently used in the Western world to represent the number 2 traces its roots back to the Brahmin Indians, who wrote 2 as two horizontal lines. (It is still written that way in modern Chinese and Japanese.)
2 （二）是 1 與 3 之間的 自然數，2是唯一的 偶數 質數 （又稱偶質數）。 如果一個 整數 能被2 整除，就叫做 偶數。 反過來說，任何數 乘 以2即為 偶數。 對於用偶數進制書寫的整數，例如 十進制 和 十六進制，要判斷它是否為偶數，只需判斷最後一位是否為偶數，而2進位則只需判斷最後一位是否為0。 第1個 質數。 下一個為 3。 唯一的 偶數 質數。 唯一一組相差為1的質數對之一，其為（2、 3）。 ）。 下一個是 3。 第一個 危險質數。 下一個是 3。 此數字雖然是 自然 質數 （實質數），但不是 高斯質數。 2是第一個有此性質的自然質數。 下一個是 5。 （OEIS 數列 A002313） 第2個 虧數， 真因數和 為1，虧度為1。 前一個為 1 、下一個為 3。
2 （二）是 1 与 3 之间的 自然数，2是唯一的 偶數 質數 （又稱偶素數）。 如果一个 整数 能被2 整除，就叫做 偶数。 反過來說，任何數 乘 以2即為 偶數。 对于用偶数进制书写的整数，例如 十進制 和 十六進制，要判断它是否为偶数，只需判断最后一位是否为偶数，而2進位則只需判断最后一位是否为0。 第1個 質數。 下一個為 3。 唯一的 偶数 素数。 唯一一組相差為1的質數對之一，其為（2、 3）。 ）。 下一個是 3。 第一個 危險質數。 下一個是 3。 此數字雖然是 自然 質數 （實質數），但不是 高斯質數。 2是第一個有此性質的自然質數。 下一個是 5。 （OEIS 數列 A002313） 第2個 虧數， 真因數和 為1，虧度為1。 前一個為 1 、下一個為 3。
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The number two (2) is the second positive integer and the first prime number. It is even, and is the only even prime (the primes other than 2 are called the odd primes). The number 2 is also equal to its factorial since 2!=2. A quantity taken to the power 2 is said to be squared.
2的次方表（1~64次方）2的1次方：22的2次方：42的3次方：82的4次方：162的5次方：322的6次方：642的7次方：1282的8次方：2562的9次方：5122的10次方：10242的11次方：20482的12次方：40962的13次方：81922的14次方：163842的15次方：327682的16次方：655362的17次方：1310722的18次方：2621442的19次方：5242882的20次方：10485762的21次方：20971522的_2的次方表.
A West Arabic numeral, ultimately from Indic numerals (compare Devanagari २ (2)), from a cursive form of two lines to represent the number two. See 2 § Evolution for more.
Explore the hidden side of 2, the only even prime number. Includes Prime Factorization, Divisors, Bases and Much More! A fascinating math reference for students, coders, scientists, puzzle solvers, and anyone who enjoys numbers.
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