Is there any standard notation for the distribution of the difference of two random variables. For the sum of two random variables $X$ and $Y$, we can write,
$f_{X + Y}(t) = (f_X \ast f_Y)(t)$
but I can't seem to find any standard notation for representing the difference.
Edit: To clarify, $X$ and $Y$ are independent continous random variables. I could write out the whole equation,
$f_{X-Y}(t) = \int_{t'} f_X(t') f_Y(t'-t) dt'$
but I was wondering if there is some notation similar to that for convolution where I could just write
$f_{X-Y}(t) = f_X(t) \ast f_Y(-t)$
Note: The $\ast$ symbol is used in the Wikipedia page for convolution here: https://en.wikipedia.org/wiki/Convolution.