Date: Tue, 26 Sep 2000 23:14:28 -0400

From: Alex Bogomolny

Dina Zeliger wrote:

*A power is the product of a number multiplied by itself a given number of
times. i.e. n^k = n*n*...*n (k times). This definition in right when k>0.
But, if k=0, how come the product of multiplying a number by itself zero
times equals one?*

The definition n^k = n*n*...*n (k times) only makes sense when k > 0, or even when k > 1!. k = 0 is a completely separate case and requires a separate definition.

*zero is basically nothing.*

Zero is not nothing. There's a difference between 1 followed by nothing which is just 1 and 1 followed by 0 which is 10.

*its value is not a quantity,*

and what is "quantity"?

*i.e. zero times something is nothing - zero.*

Which proves nothing but is not zero!

*in that case, how is it possible that n^0=1.*

By definition.

*multiplying n by itself zero times equals nothing, since you don't multiply it at all.*

That's right. The reason for that definition is different.

*That theory also suggests that 0^0=0, *

Do not see what theory you are talking about.

*and that this expression is not indefinite. *

Every definition must have some reasons. 0^k = 0 is only meaningful because n^k = n*n*...*n (k times). So that k > 1. You can't derive from here 0^0 = 0!

*if (n^0=0) and (0^n=0) then (0^0=0).*

Nonsense. Both only make sense when n is not zero. You can't quote any thing rule you might have studied that allows for that implication. The form

if blah-blah and blah-blah then blah-blah

is not necessarily a correct derivation.

Regards,

Alexander Bogomolny

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