Explanation:
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Every element of the range set is a co-domain, hence the surjective function is defined with reference to the elements of the range set.
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A surjective function has an image that is the same as its co-domain.
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A surjective function's range, co-domain, and image are all the same.
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We may also argue that a surjective function is an onto function if every
co-domain has at least one pre-image
domain and 
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Let's have a look at surjective function in more detail.
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Assume and. A = {1, - 1,2,3} = {1,4,9}.
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Because each element of has at least one pre-image in A,
is surjective.
Final Answer:
A surjective function is one in which each element in the domain of has at least one element in the domain of, resulting in
.
Example:
is surjective.