Abruzzi (or, more correctly, Abruzzo, in the singular form) is a region of Italy, formerly a part of the "Abruzzi e Molise" region (with Molise).
Provinces:
... element 2a is zero and it is impossible to divide by it.) The symbol <math>\pm \sqrt {b^2-4ac}</math> in the formula should be understood as "either of ...