Inclusion relationship is a relationship between conceptual extensions, which usually refers to the genus-species relationship. Sometimes it's just a general term for true inclusion relation and true inclusion relation. Inclusive relationship also includes the same relationship between ideological extensions (or classes).

A random phenomenon has two events a and B. If any sample point in event A must be in B, it is said that A is contained in B, or B contains A, and it is recorded as "A is contained in B": A? Or "b contains a": b? A, then the occurrence of event A will inevitably lead to the occurrence of event B.

Extended data:

Common mathematical symbols:

1, greater than sign

A symbol indicating that the number on the left is greater than the number on the right. Write it down as ">" and read it as "greater than". Such as 9 >; 8 means that 9 is greater than 8.

2. Less than sign

A symbol indicating that the number on the left is smaller than the number on the right. Write it down as "

3. Operation symbols

A symbol indicating that it belongs to an operation. For example: plus sign "+",minus sign "one", multiplication sign "×" and division sign "∫". ,

4, operation sequence symbol

A symbol indicating the sequence of operations. For example: parentheses "()", brackets "[], braces" {} ". Using these symbols can change the normal operation order, and can also indicate that several numbers or operations are combined together, so it is also called combination symbols.

5, the relationship between elements and sets

Does the relationship between elements and sets belong to (∈) or not (? ) relationship.

The relationship between sets includes (? ,=,? ) does not contain (? ,? )。

Baidu encyclopedia-relational symbols

Baidu Encyclopedia-Inclusion Relation