DIVISION & ZERO
n/0 where n is nonzero is undefined,
but is arguably equal to "infinity."
0/n where n is nonzero is defined
and is always equal to zero.
0/0 is indeterminate and can be
shown to be equal to any number,
hence we'd also say it's undefined.
This graphical display "explains" 0/0 :
http://www.friesian.com/calculus.htm#zero
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