Not that this and Latex aren't great, but I wonder if there is a more outside the box solution. APL can represent mathematics very well using Iverson Notation a

Not that this and Latex aren't great, but I wonder if there is a more outside the box solution. APL can represent mathematics very well using Iverson Notation as the design and it is executable to boot. I haven't spent a ton of time with it, so I'm not sure if I could read complex equations as easily with it or not once suitably trained. Other benfits of APL's notation is no order of operations and all you need is the character set which is really easy to deal with I would guess. If it hasn't become popular after 1/2 century, perhaps there really is something to the critical mass of our current notation.