Have an element list \Delta, these Elements have sub values, \alpha, \beta, \gamma.
I want to write:
the minimum from the sub element \alpha, over all elements \Delta.
How can I write this mathematically correct (in latex)?
\min ...
thx
The key part is to just be clear about what you mean. Since it's not clear what exactly $\Delta$ consists of, suppose $\Delta$ is some arbitrary collection of elements $S$, where we use $S_\alpha$ to denote the $\alpha$-component of $S$. Then we could write
$$\min_{S\in\Delta}S_\alpha$$
to denote the minimum of all $\alpha$'s. Another approach (which I do not like as much, but still works), would be to define a function
$$\phi:\Delta\to\mathbb{R},\quad S\mapsto S_\alpha,$$
i.e. $\phi(S)$ is the $\alpha$-value of $S\in\Delta$. We could then write
$$\min_{S\in\Delta}\phi(S).$$
Of course there are other ways to do it as well; the most important part is to be clear.