



 
Hi Marsia, I am going to show you some examples using diagrams and then give a mathematical definition. These are four functions from a set A to a set B.
The concept of one to one I tried to illustrate in the diagrams is that if an object in B is the image of some object in A then it is the image of only one object in A.
Example 1:
Example 2:
I hope this helps,
 


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