I found the following from a book with no proof:
Let be defined by the formula , then is called the identity function, denoted by or by .
Let and it has the inverse function , then
Question: Is it true that ?
Isn't ?
I found the following from a book with no proof:
Let be defined by the formula , then is called the identity function, denoted by or by .
Let and it has the inverse function , then
Question: Is it true that ?
Isn't ?