some small equivalenzes
1 + 1 = 2 {\displaystyle 1+1=2} ;-)
2 2 = 1 2 {\displaystyle {\frac {\sqrt {2}}{2}}={\frac {1}{\sqrt {2}}}}
e i π + 1 = 0 {\displaystyle e^{i\pi }+1=0}
