Re: ** says: Definition: sum{i in N} i = 0

On 13 jul, 23:03, Virgil <vir...@xxxxxxxxxxx> wrote about sin(x)/x :

On the contrary, the "other" one (undefined at 0) is quite useful in the
teaching of mathematics.

And one of the things it teaches is that the expression sin(x)/x is not
defined at x = 0.

In teaching _mathematics_. What a vicious circle! What a non-argument!

What may transpire in physics usage is occasionally invalid in
mathematics, as in this instance.

Occasionally? Better explain why sin(x)/x (x=0) = 1 ALWAYS in physics!

Han de Bruijn

.

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