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Tag: functions

Properties of functions on finite sets

Posted on 2014/05/262015/12/03 by Rebecca

This is an exam problem I gave once; you’ll need to know |A| is the size/number of elements of A. Let A and B be finite nonempty sets, and f a function from A to B. Fill one I, for injective (1-1), and one S, for surjective (onto), in each line of the following table […]

Posted in discrete math. Tagged functions, relations. Read More

Pop Quiz

Posted on 2014/04/072015/12/03 by Rebecca

Let A = {1,2,3,4,5}. Define a function f from A to A that is also a transitive relation, but is not the identity function. Answer after the jump.

Posted in discrete math. Tagged functions, relations, transitivity. Read More

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