Mathematica Tutorial: Notebooks And Documents - Wolfram Research

Notebooks and Documents 201Characters such as l and are treated by Mathematica as letters~just like ordinary keyboardletters like a or b.But characters such as ⊕ and ü are treated by Mathematica as operators. And although theseparticular characters are not assigned any built-in meaning by Mathematica, they are neverthelessrequired to follow a definite syntax.ü is an infix operator.In[7]:= 8a, b, c< ü 8c, d, e