This seems to say that it is a JOKE
I'm not sure if I understand the joke.
But I think they mean that because the mathematician is using the computer so much, they are effectively a computer operator (i.e. Clerk).
Vice versa, A Clerk using a computer, can act like a mathematician, because they are using the power of the computer to do mathematical things, even though they are NOT a mathematician.
In my interaction with "mathematician", I found that most of them dont use computer to do mathematic at all.
I found the quote from this book http://www.amazon.com/dp/0393979504
In my interaction with "mathematician", I found that most of them dont use computer to do mathematic at all.
I found the quote from this book http://www.amazon.com/dp/0393979504