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Re: Functions w/ Injective and Surjective
Posted:
Oct 13, 2012 2:45 AM
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surjective: f(n) does not have two values for the same n
injective: f(n) does not have two different n giving the same value
bijective: both injective and surjective
a) inverse of answer to b)
b) f(n)=number of divisors of n
c) f(n)= n-1 if n is even, n+1 if n is odd
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From: Edward <discussions@mathforum.org>
To: discretemath@mathforum.org
Sent: Friday, 12 October 2012, 5:30
Subject: Functions w/ Injective and Surjective
How could I give an example that function f: ??? that is
(a.) injective but not surjective
(b.) surjective
(c.) and both bijective
Using N obviously it involves Natural numbers. How can this be shown?
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