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I have an expression which depends on two integers, n,d.

Now, I want this expression to be

a) 1 when d=n=0,

b) some expression (that I won't write here) when both d and n are >0

c) zero when wither d or n negative.

At first I defined the function using Kronecker deltas and the Heaviside Theta function but the problem is that the expression that is valid when d and n are greater than 0 contains a factor d/n, and even if the Heaviside Theta function is zero when d=n=0, Mathematica gets an indeterminate result because of the division by n. I want to force it to be zero.

Thank you!