Question

Give an example of a relation that is NOT a function and explain why it is not a function.

Answer 1

let A={a,b,c} and B={1,2,3} then {(a,1),(c,2)} is a relation that is not a function

Answer 2

dont understand

Answer 3

what don't u understand?

Answer 4

a relation from A to B is just a subset of the carthesian product of A and B

Answer 5

a function from A to B is also a subset of the cartesian product of A and B (hence functions are relations) but with the aditional requierement that EVERY element of A is aisgned to some element of B.

Answer 6

oh i get it

Answer 7

the example i gave u {(a,1),(c,2)} is not a function becuase. ..