# Fill in the blank: A function f : X → Y is said to be ______, if every element of Y is the image of some element of X under f, i.e., for every y ∈ Y, there exists an element x in X such that f (x) = y.

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Answer: Onto or Surjective.

# Fill in the blank: A function f : X → Y is said to be onto or surjective, if every element of Y is the image of some element of X under f, i.e., for every y ∈ Y, there exists an element x in X such that f (x) = y.

answered Mar 12, 2013
True or False: A Function can be both one-one and onto.

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