2 is a natural number between 1 and 3. There are many mathematical properties. If a number is divisible by 2, it is an even number. 2 is the smallest first prime number (also called prime number). It is also a network language; Atomic number of helium, etc. As we all know, in the network, 2 usually has three meanings, one is "love", such as 520= I love you, 20 13 14= love you all your life, 258= love me, and the other is "stupid" and "stupid". For example, 2 goods, note: 2 13 means 2B, and there is another meaning to describe a person who is lively, cheerful, humorous and has personality, such as "2 is very radiant". (2) (Arabic numerals are used for serial numbers, generally used for small questions) different languages; ② (Usage is the same as ②) (Usage is the same as ②) ② (Simplified Chinese, pronounced as er) (II) (Chinese, with brackets, used for addressing) ② (Chinese, capitalized' II', generally used for bank bookkeeping). Pronunciation er) II (Roman numeral 2) two (English cardinal number 2) second (English ordinal number, second)second (English, attribute: even Arabic numerals: 2 Pronunciation: èr dialect: nì è lowercase: two or two capitals: two special symbols: ② υ Ⅱ English: two (cardinal number: two) second. Twice (twice) Roman numerals: II binary: 10 octal: 2 hexadecimal: 2 BCD842 1 code: 00 106. For example, Block 2 and Product 2 are the only even prime numbers (prime numbers) 2 in Chinese characters, where "m" and "m" But this word is generally considered to be misspelled. "Er" is a traditional Chinese character (regular character) used in general bank accounting, and the rest are variant characters, which are popular in some periods or categories of Chinese characters. & lt/SPAN>。 & lt/p & gt； For integers written in even-numbered systems, such as 10 system and 16 system, it is only necessary to judge whether the last bit is even or not, while binary only needs to judge whether the last bit is 0 or not. Is the only even prime number. The next prime number is 3. Because there is more than one factor, it is also a high composite number, and the next high composite number is 4. 2 is the third Fibonacci number and 1 positive prime number in Fibonacci sequence. 2 is a unique Supronik number. 2 is the smallest number that can be decomposed into the sum of two nonzero complete squares: 2= 1+ 1 the simplest nontrivial group of order 2-that is, the residual group of order 2. Quadratic function: Y = AX 2+BX+C (A ≠ 0, A, B, C are constants) The quadratic function called X is a digital quadratic curve made by cars, also known as conic curve, which is the most thoroughly studied curve except for straight lines in history. Quadratic equation: the lowest order nonlinear equation with general solution formula. Dihedral group: the simplest antinomy of finite generating noncommutative groups: if two propositions contradict each other, then one of them must be wrong. Quadratic reciprocity law: one of the most profound theorems in classical number theory, discovered by Gauss! Dihedral angle: A straight line in a plane divides a plane into two parts, and each part is called a half plane. The figure formed by two half planes starting from a straight line is called dihedral angle (this straight line is called the edge of dihedral angle, and each half plane is called the face of dihedral angle). Plane angle of dihedral angle: take any point on the edge of dihedral angle as the endpoint and make two rays perpendicular to the edge in two planes, which is formed. Straight dihedral angle: A dihedral angle whose plane angle is a right angle is called a straight dihedral angle. 2 is the only prime number in even numbers! P+p=2p Addition becomes multiplication. P× p = p 2 is multiplied to a power. The power of pp = p↑↑2 becomes Tetralxion. The smallest object has two elements. The arithmetic square root of 2 is the earliest irrational number discovered. Composition of two forces: if the effect produced by one force is the same as that produced by the interaction of two forces, this force is called the resultant force of those two forces, and finding the resultant force of these two forces is called the condition for the composition of the two forces: if the two forces acting on an object are equal in magnitude and opposite in direction, they will be balanced with each other. Newton's second law of motion: the content of the law: the acceleration of an object and its force. In the field of DVD, it represents Europe, South Africa, the Middle East and Japan. Year: 2 years, 2 years BC, 1902. Idiom: You can't do two things at once. Philosophy: Dualism, Dichotomy. Biology: diploid, that is, an organism with two chromosomes in its somatic cells, such as human beings. Music: The number 2 is the most active number to pronounce ruai. It always appears in the natural science we study and in our life. Electricity: 1 There are two connection modes for electrical appliances (series connection and parallel connection). Chemical formula: The chemical formula of many elemental gases on the earth is X2, that is, they are composed of two X atoms. O2, N2, H2, Cl2, F2 ... many, many. There are many things in our bodies that also appear in pairs. You can also find a lot from top to bottom: brain: left brain VS right brain. Eyes: left eye to right eye. Hand: left hand PK right hand. There are too many such examples, ............. To sum up, 2 is a very balanced number! If there is no opposition between left and right, I'm afraid people can't even stand still. 2 is still symmetrical. A piece of paper folded in half presents us with two identical worlds. No matter whether it is an insect or a mammal, the number of legs must be a multiple of 2, otherwise how can we survive? The mirror also shows us two consistent worlds. Some grammars in English embody some special meanings of 2. For example, I already have two apples. If I want a third apple, I must use the second ...................................................................................................................................................... 2, which is a fence from singular to plural. Have you ever wondered why two people fall in love? Two people, in everyone's subjective consciousness, living with only one "TA" and "I" will increase the sense of security for love in one's eyes. Imagine if three people kiss, each person must kiss twice, a total of three times. Are you tired? Two people always need to kiss 1 time, which is the best choice arranged by God for mankind. With all that said, why can't three people get married? Because there are only two sexes in human beings! (excluding shemale). According to the principle of pigeon hole, if two sexes are regarded as drawers and three people are regarded as objects, then there must be more than two homosexuals. By the way, the "2" given by God has two sexes. If human beings have three genders, it is worth discussing to reproduce. There are many opposites in nature in .................................................................................................................................................................. There are two kinds of magnetic poles, N and S, two kinds of male and female, two kinds of charges,+and-,and even two kinds of substances, positive matter and antimatter. There are two stars in nature, yin and yang fish (the symbol of Tai Chi) in China, positive and negative north and south, ... Think about the computer you are using. The computer uses binary because the circuit has two states: on and off (short circuit on), that is, the current is divided into two states, yes and no, and the computer is made up of this little 1 and 0. Some people use 2 instead of fools and idiots. However, without the wonderful "2", is the world still like this? 2 has existed since ancient times, and 2' s culture came into being with the development of human history. In ancient China, the army needed two things: symbols and orders. Scholars can't give lectures without 2. No one has ever 1 given himself a lecture or asked himself a question, and no scholar has ever asked himself a question. A king needs two things to govern a country. He heard about it at court and made an in-depth investigation. ..... In short, 2 plays a huge role in China literature. Since Pangu, two men and women have been created. From Qin Shihuang's unification of the six countries, division and rule, and reunification, people have two thoughts. With the establishment of 1949 new China, history has changed, and people have two concepts: old and new. ..... Times are two changes. Now it is 20 1 1, but the new generation will not. The difference between two centuries. There are two meanings, one is positive and the other is negative. When derogatory, it is used to describe a person who is simple-minded and stupid. Such as: Yu XX is really 2! That is to say, Yu XX is stupid. When commending, describe a person as unique and stylish, cute ~ humorous ~ elegant ~ there is a saying called "very 2 very radiant", such as Zhang Sanzhen 2! That is to say, Zhang San is "brilliant", and he can also say "2 ..." When he spits, it means that this work is terrible and speechless, which is equal to two. to EG Nice 2 meet u also has examples of binary numbers:1001010. For example, when you confess to others, you can use "520" to implicitly express two, too, To EG Nice 2 meet u, and the binary number: 65 "2" has a very simple and special application in China Internet. That is, "2" stands for "no", "no", "don't" and "not ready". We often see netizens typing "11111"and "2222" on the instant chat platform of online game forums. For network novices, I don't know what it means. 1 as opposed to "2" can be understood as "Yes", "Yes", "Approved" and "Ready". "1" and "2" are used to express "approval" and "disapproval", which can be traced back to the early online games "Legend" and "Poké mon". Especially in Magic Baby, players are used to using "1" and "2" to mean "yes" and "no". Later, because their ideas were simple, quick and convenient to express, they quickly became popular on the Internet. 1"2", like "PK", is the characteristic network language of China Internet! 2 is also a word that indicates a person's IQ.