Unique, indicating a limited number. Meaning in mathematics: there is exactly one, only one meets the requirements, and it is the only quantity.
Words.
Existence and uniqueness mean "existence and uniqueness". "You" means "being" and "only" means "only".
In mathematics, there is and only uses "?" Representation, that is, unique quantifier representation, belongs to logical symbols.
Existence and only does not mean any two-way relationship, but a combination of uniqueness and existence. Among them, it is obvious that "you" stands for existence and "unique" stands for uniqueness. This is a description of the attributes of an object, not the relationship between two objects.
Extended data:
About the only example:
Among the students in our class, only Xiao Wang is party member.
There is only one child skipping rope on the lawn.
In mathematical language, "You" means at least one, "Only" means at most one, and "You and Only" means exactly one.
4. Only the * * * production party can save China.
Although there seems to be no answer to this math problem, there is and there is only one answer.
6. Only one person passed the evaluation.
7. Everyone has one and only one chance to come to the earth.