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Q: What's the difference between an exorcist and a mathematician?
A: The exorcist casts out demons; the mathematician casts out nines.

Q: What's the difference between Calculus and Chaos?
A: A difference of formulas, but Chaos sometimes uses Calculus.


Casting out nines is the process of finding the remainder of a number from division by 9. This is done by adding all the digits together. For example:

(18463 mod 9)=(3+6+4+8+1)=22
=(2+2)=4.

Look it up on Wikipedia.

I haven't understood about "nines". Does "nine" mean something other than "9"?
--
Victor Porton - http://www.mathematics21.org
* Algebraic General Topology and Math Synthesis

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