On 7/7/2013 3:07 PM, Stavros Macrakis wrote:
>
>
> Re x*delta(x)/x, what is the /disciplined/ way of handling that? Why
> do you simplify (x*delta(x)) first? Why doesn't it associate as
> x*(delta(x)/x), which presumably is undefined at zero? (or is it?)
>
>
You don't allow multiplication by delta(x) by a function of x. require
instead of a(x)*delta(x), something like delta2(x,a(x)).