I've had division by zero represented to me two ways. The first way is that all division by zero is undefined. Thus, 0/0, 1/0 and 22687/0 are all the same. All are undefined. The second way is that division of a non-zero and zero is different to zero divided by zero. In that 0/0 is classed as being indeterminate rather than undefined as it is in all other cases. i.e https://www.khanacademy.org/video/undefined-and-indeterminate Which is correct? If the second is correct, how would one best describe the difference between indeterminate and undefined?