'Surjection iff rng' presentation slideshows

Look at the illustration on page 205 and the examples on pages 206 and 207.

DEFINITION A function f : A ? B is onto B (called a surjection ) iff Rng( f ) = B . We write f : A ? B to indicate that f is a surjection. onto. To show that f is onto B , we can show that for any b ? B , there must be some a ? A such that f ( a ) = b.

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