Hi to all,

I am new here, and also relatively new to poker too.
Would anyone please take the time to answer this question for me, or at least point me in the direction of articles/vids that show how to do this please.

So, how do you work out from a mathematical viewpoint, ( HU & read less from small blind ) what is the best option to take with a hand pre-flop?
Thank you.

I have started playing Hu Sit and go's, and have watched a few vids, and read quite a few articles about this game type, but I keep coming across quotes like:-
" it is +ev here to open with this hand rather than open fold " or " we do better here limping, rather than losing our .5 of a big blind " or " we can at least break even here limping rather than folding " or " limping J,3o here, is more ev than folding " or " we can do better here by limping than negative .5 of a big blind " or " by comparing to a constant, which is folding "
And so far I have not heard these statements qualified with proofs!
So my question is - How have they came to these conclusions?
Is there some math/equation that is used to compare options of openfolding v min-raising v limping.
I am trying to find out how to do the theory behind the above quotes, so I can think for myself when designing for example, my own pre-flop ranges,
rather than blindlessly following others ranges, without knowing how and why they have been designed that way.
Thanks.