# Can u gave me some examples of injective function.

by yaho8888
Tags: examples, function, gave, injective
 Share this thread:
 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?
 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. 1-->3 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.
 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?
 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.

 Related Discussions Linear & Abstract Algebra 1 Precalculus Mathematics Homework 1 General Math 9 General Math 32 Calculus 4