{Math never seen}
{Johannes K{\"u}ster}
{Why have certain symbols and notations gained general acceptance, while
others fell into oblivion? And why did mathematicians happily adopt
\TeX{} as a standard, while they hardly ever used \MF{} (or other tools)
to develop new notations?
In this presentation I will give quality criteria for mathematical
symbols. I will show many unknown, little-known or little-used
notations, some of which deserve to be much more widely used.
Also I will show new symbols and ideas for new notations, especially for
some well known notions which lack a good notation (e.g., gcd and lcm,
Stirling numbers, and more).}