What is the difference between A B and AUB, and what is the difference between AUB and AnB?

Let me tell you this.

Suppose a=<1,2,3,4>

b=<4,5,6,7>

a+b=<1,2,3,4,4,5,6,7> Attention, there are 2 4s!

a b=<1,2,3,4,5,6,7> only 1 4!

What is this formula? Collection? What does A+B mean?

Suppose a=<1,2,3,4>

b=<4,5,6,7>

a+b=<1,2,3,4,4,5,6,7> Attention, there are 2 4s!

Who said this is correct.

A has an apple, a pear, B has an apple, a mango, then A + B = 4 A and B are 3 It's so complicated to say that I'll get into it for a while.

There is no such thing as a+b in set theory, and I agree with this statement. Mess around.

Explain the question first and then ask the question, otherwise you won't get the correct answer.

A+B includes repeats.

AUB does not include duplicate parts.

There is no A+B argument in set theory, it is nonsense.

A b is a+b-a b=96-11=85, you can find a b directly, and find a+b just to find a b

I think if you ask the teacher, he can say it very clearly, if you are not a student, then you can look at what is said on the third floor, and if you can understand it, you can understand it, and if you can't understand it, you can't do it.

You're not very knowledgeable about intersection and union, for example.

A has an apple, a pear, B has an apple, a mango.

Then A + B = 4 A and B are 3

The composition of the bai is not the same, contains different parts, and the number of elements is different. Return.

First, the composition is different.

1. AUB: AUB is a set that belongs to all of them.

A set of elements that are a or belong to set b.

2. ANB: ANB is a set of all elements that belong to set A and belong to set B.

Second, the inclusion is different.

1. AUB: AUB must contain A and must also contain B.

2. ANB: ANB must be included in A, and must also be included in B.

Third, the number of elements is different.

1. AUB: The number of elements of AUB must be greater than or equal to the number of elements A, and the number of elements must be greater than or equal to the number of elements B.

2. ANB: The number of elements of ANB must be less than or equal to the number of elements A, and must be less than or equal to the number of elements of B.

Comparison of the nature of intersection and union.

If set A {123}, set B {345}

then AUB {12345}

anb＝｛3｝

In fact, a and b are to copy the elements in a and b and write them in another set, and the repeated ones are only counted once.

As the name suggests, A and B are the common parts of A and B.

For example: if you gather.

baia {123}du, set zhihe b {345} then aub {12345}

anb＝｛3｝

In fact, DaoA and B are to copy the elements in A and B and write them in another set, and the repeated ones are only counted once.

As the name suggests, A and B are the common parts of A and B.

One is an intersection, one is a union, the first is like all elements, the second is a common element, and an empty set is a subset of any set.

One is for two together, and the other for two parts that are common.

The first is to acquire the number that is all of the two, and the second is to acquire the number that is common to the two.

a b is the intersection.

a b is the union.

Intersection refers to the elements that belong to both a and b in sets a and b, and is written as a b in mathematics.

In set theory and other branches of mathematics, the union of a set of sets is the set of all the elements of those sets and contains no other elements.

The former refers to the addition of different elements in A and B, and the latter is the element that they have in common.

The former is the sum of the two and the latter is a part common to both.

The first one is all the elements of A and B.

One is union and the other is intersection.

A and b are the sets of all the elements (except weight), A and B.

1. The three characteristics of the elements in the set: certainty, mutual heterogeneity, and disorder

2. The relationship between the elements in the set and the set:

There are two types of relationships between elements and sets, which are represented by and . To study a set, we first look at the representative elements in the set, and then look at the constraints of the elements, and when the set is represented by descriptives, pay attention to clarify what the meaning of its element representation is.

Note the peculiarities of empty sets.

An empty set is a set that does not contain any elements, and an empty set is a subset of any set When solving the problem, if the set is not explicitly stated, consider the possibility that the set is an empty set For example: a b, you need to consider two possible cases: a and a≠.

1. To study the problem of the set, we must grasp the elements and see the properties that the elements should satisfy, for the set containing letters, after finding the value of the letters, we should pay attention to testing whether the elements of the set meet the mutual heterogeneity

2. For the equality of sets, it is necessary to analyze which element in the known element is equal to another set, and list the equations (groups) in several cases to solve, and pay attention to testing whether the mutual heterogeneity is satisfied

3. There are often two ways to judge the relationship between two sets: one is to simplify the set and find the relationship between the two sets from the expression; The second is to use the enumeration method to represent each set and find relationships from the elements

4. When the relationship between two sets is known to find the parameters, the key is to transform the relationship between the two sets into the relationship between the elements, and then into the relationship between the parameters to solve this kind of problem

5. When performing the operation of the set, it is necessary to use the venn diagram and the number axis as much as possible to make the abstract problem intuitive; generally, the set elements are represented by the venn graph when they are discrete; When the collection element is continuous, it is represented by a number line, and when it is represented by a number line, pay attention to the trade-off of the endpoint value

6. When solving the problem of a b, a b, etc., we must first consider whether a or b is an empty set to prevent missing the solution

A b means that A intersects B, i.e., the common part of Set A and Set B. AUB means A and B, i.e. all of Set A and Set B.

For example: two sets a{1,2,3},b{1,2,4,5}.

Then a b denotes the element common to the set ab, i.e., {1,2}.

AUB represents all the elements of two sets, which are common only once, i.e. {1,2,3,4,5}

1. Abnormal uterine bleeding (AUB).

Abnormal uterine bleeding (AUB) is a common symptom and sign, as a general term, refers to abnormal bleeding originating from the uterine cavity that does not match any 1 of normal menstrual cycle frequency, regularity, menstrual length, and menstrual bleeding amount.

2. American University of Beirut

Founded in 1866, the American University of Beirut is located on the northern slope of the Beirut headland, overlooking the blue Mediterranean Sea and surrounded by greenery. The university is a comprehensive university with the strongest faculty, scientific research and influence in Lebanon and the Middle East, and is known as the "Harvard of the Middle East". The first Chinese student graduated in 2014, and in the same year, the school was accredited by the Service Center for Scholarly Study of the Ministry of Education of China.

Geographical location. AUB is located in Beirut, the capital of Lebanon in Western Asia, bordering the Mediterranean Sea. Its main campus is located in the heart of Beirut, adjacent to the Mediterranean Sea, and covers an area of nearly 380 acres. The other campus is in the Bekaa Valley, which is the school's agricultural and food practice experimental base, covering an area of about 1,300 acres.

Faculties: Faculty of Arts and Sciences, Faculty of Medicine (including a nursing school), Faculty of Engineering and Architecture, Faculty of Agricultural and Food Sciences and Department of Public Health, College of Business.

Majors: Medicine, Engineering Technology, Biology, Accounting, Business Administration, Finance, Management Information Systems, Marketing, Computer and Information Technology, Education, English, Foreign Chinese Languages and Literature, Health, Nursing, Mathematics, Psychology, Religion, Physics, Chemistry, Philosophy, Sociology.

Is this math?

A set that contains all the elements (except for weight) in both sets A and B, A and B

1. AB is the probability of A and B occurring at the same time, and A and B are the probability that A or B have one or two occurrences.

2. The expression is different: the expression of AB is A B, and the expression of Stove Posture A and B is A B.

3. The calculation formula is not implicitly the same: p(a+b)=p(a b)=p(a)+p(b)-p(ab), p(ab)=p(a)p(b|).a), ab is the probability that a and b occur at the same time, and a and b are the probability that a or b has one or both occurrences.

4. Different expressions: AB is expressed as A B, and A and B are expressed as A B.

5. The calculation formula is different: p(a+b)=p(a b)=p(a)+p(b)-p(ab), p(ab)=p(a)p(b|).a)。

Is p(aub) and p(a+b) the same meaning in probability?

When a and b are mutually exclusive events, they are equal.

The former is the probability of the occurrence of a and b's concurrent events (either or both of a and b can occur).

The latter is the algebraic sum of the probability of a occurrence and the probability of a occurrence of b.

When a and b are mutually exclusive events, they are equal.

The intersection of events A and B is empty, and A and B are mutually exclusive events, also known as mutually incompatible events.

It can also be described as: events that cannot occur at the same time.

If a b is an impossible event (a b= ) then event a and event b are mutually exclusive, which means that event a and event b will not occur at the same time in any trial.

Because aub=a.

If any one of the elements of set A is an element of set B, then set A is called a subset of set B.

Symbolic language: if a a, both a b, then a b.

A b means that A intersects B, i.e., the common part of Set A and Set B. AUB means A and B, i.e. all of Set A and Set B.

For example: two sets a, b.

Then a b denotes the elements common to the set ab, i.e.

aub represents two sets of all the elements, and the common cosmetic is counted only once, ie.

Expand the information of the Lu Leak Li Zhan:

Nature of Intersection :

1) If the intersection of two sets A and B is empty, then they are said to have no common element, write: A b =

2) The intersection of any set with an empty set is an empty set, i.e. a =

Nature of union:

1) An empty set is a unit element of union operations. i.e. a=a. For any set a, you can use the empty set search as the union of zero sets.

Union and intersection satisfy each other's distributive laws, and these three operations satisfy de Morgan's laws. If you replace the union operation with a symmetry difference operation, you can obtain the corresponding Boolean ring.

A b means that A intersects B, i.e., the common part of Set A and Set B. AUB means A and B, i.e., the set A and the set B.

For example: two sets a{1,2,3},b{1,2,4,5}.

Then a b denotes the element common to the set ab, i.e., {1,2}.

aub represents all the blocking elements of two sets, which are common only once, i.e. {1,2,3,4,5}

The emphasis on split is to separate forcefully, with the degree of tearing or violent.