Register to reply

Can u gave me some examples of injective function.

by yaho8888
Tags: examples, function, gave, injective
Share this thread:
Feb5-08, 07:07 PM
P: 62
can u gave me some examples of injective function that is not surjective.
Is f(x)=y a injective function that is not surjective?
Phys.Org News Partner Mathematics news on
'Moral victories' might spare you from losing again
Fair cake cutting gets its own algorithm
Effort to model Facebook yields key to famous math problem (and a prize)
Feb5-08, 09:43 PM
P: 1,635
what about f:N--->N defined by f(n)=3n where n is from naturals, and N is the set of naturals.

2-->6, so this function is injective since when f(n_1)=f(n_2)=>3n_1=3n_2=>n_1=n_2, but it is not surjective since there exists at least a numberf in the second N, in our case for example 1 that there are no numbers in N(the domain) such that when f(n)=1.
Feb5-08, 09:45 PM
P: 1,635
You can go and define such functions as much as you wish, for i just made that example up. OR are you looking for any other example in particular?

Feb5-08, 10:37 PM
P: 363
Can u gave me some examples of injective function.

f:[0,1] -> R given by the identity function.

f:R -> C given by identity function.

Register to reply

Related Discussions
The module is injective iff it is a direct summand of an injective cogenerator Linear & Abstract Algebra 1
Non-Injective functions Precalculus Mathematics Homework 1
Injective function proof General Math 9
Is x^x injective? General Math 32
Injective function Calculus 4