up:: Preimage of Function
Let be a function and subsets .
Then let a point in ‘s preimage. Then
By the definition of the preimage of a function, we have that
Thus, and .
Therefore, .
up:: Preimage of Function
Let be a function and subsets .
Then let a point in ‘s preimage. Then
By the definition of the preimage of a function, we have that
Thus, and .
Therefore, .