I have a function with two parameters: $f(s,t)$.
I want to assign to the function $\alpha$ and $\beta$: $f(\alpha,\beta)=5$.
But I don't want the reader to confuse $s$ and $t$ (the function's variables) from the values $\alpha$ and $\beta$.
I want to mention explcitly which is assigned to $s$ and which is assigned to $t$.
So I would like to denote it, for example, like this: $f(s=\beta,t=\alpha)=5$, or like this $f(s:\beta,t:\alpha)=5$.
Is there a convention for such a notation?
What is the correct notation?
Best Answer
You can write the function $f(s,t)$ evaluated at point $(\alpha, \beta)$ as
$$f(s,t)|_{\alpha,\beta}=5$$
even your notation is also widely used i.e. $$f(s=\beta,t=\alpha)=5$$
I don't think your last notation is used much for this purpose.