# Unnamed article

2021-05-04 12:42:37

The mathematical symbols commonly used in this official account

Focus on “ Sanxing scientific innovation ” Friends of WeChat official account will find that some of the official account numbers will bring some mathematical symbols. , Some are common mathematical symbols , Some are less common mathematical symbols , Some symbols are difficult to grasp even if you are a math major , The main reason is that there are too many mathematical symbols , It's hard to categorize , The maintenance of mathematical symbols is a long-term work of continuous enrichment and improvement , It should be one version after another , This paper tries to do classification cleaning , The examples are vivid , Accurate interpretation , Welcome to leave a message for correction .

（ This update time 2021-03-28）

• aggregate
Symbol Mathematical meaning example paraphrase
Positive integer set 0 It does not belong to the set of natural numbers
Set of natural numbers 0 It belongs to the set of natural numbers
Set of integers -2 Belongs to the set of integers
Set of real numbers Radical sign 2 It belongs to the set of real numbers
Set of rational numbers Radical sign 2 It does not belong to the set of rational numbers
Complex sets 2+i The combination of real number and imaginary number
Set of imaginary numbers i Unit imaginary number
An empty set
• Set operations
Symbol Mathematical meaning example paraphrase
Belong to 2 It belongs to the set of natural numbers
Do not belong to -2 Does not belong to the set of positive integers
intersection aggregate And assemble The intersection of is a set
Combine aggregate And assemble The union of is a set
contain aggregate Contains sets
It really includes Set true Contains sets
Included in aggregate Contained in collection
It's really contained in aggregate True inclusion in set
| | Potential of set \$ A
- The difference in the set Radical sign 2 The difference set belonging to real number set and rational number set , The set of irrational numbers
• operation
Symbol Mathematical meaning example paraphrase
- Subtraction 3-1=2 3 subtract 1 be equal to 2
Multiplication （2*3=6） 2 multiply 3 be equal to 6
division （6/3=2） 6 Divide 3 be equal to 2
| | The absolute value |-3|=3 negative 3 The absolute value of is equal to 3
Factorial 5 The factorial representation of from 1 Start to 5 The tandem of
prescribing 2 prescribing
Take the logarithm Yes 4 Take 2 Log base
Take 10 Is the low logarithm Yes 100 Take 10 Log base
Take natural number e Is the low logarithm Yes 10 Take e Log base
= be equal to
< Less than 2<3 2 Less than 3
Greater than 3＞2 3＞2
<< Far less than 2<<10000 2 Far less than 10000
>> Far greater than 10000>>2 10000 Far greater than 2
Equal to
because Often used to prove
therefore Often used to prove
There is
arbitrarily
Not ┐q Not q proposition
Introduction Conditions p Draw conclusions q
And proposition p And proposition q
or proposition p Or proposition q
Lianga i from 1 Add to 5 be equal to 15
multiply continuously i from 1 Add to 5 be equal to 120
C Combinatorial number from 6 Take out... Of the different elements 2 A combination of elements , common 15 Maybe
A Number of permutations from 6 Take out... Of the different elements 2 An arrangement of elements , common 30 Maybe
It's just infinite
Negative infinity
（ ） greatest common divisor （4,6）= 2 4 And 6 The greatest common divisor of 2
Common multiple [3, 4] =12​ 3 And 4 The minimum common multiple of is 12
• other Readers are welcome to provide more clues

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