It is a surjection.
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a function is a one-to-one and many-to one relation
1. One to One -function- 2. One to Many -relation- 3. Many to Many -function-
A function is a relationship that is one-to-one or many-to-one but not one-to-many. Thus, if a and b are in the domain of the function, then their images in the range, f(a) and f(b) MUST be equal.
For an algebraic function in one variable, as many as the highest power of the variable.
Any graph of a mapping which is one-to-one or many-to-one but not one-to-many.