Decades: 1960s 1970s 1980s 1990s 2000s - 2010s - 2020s 2030s 2040s 2050s 2060s
Years: 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
... Generalizations The formula and its proof remain correct if the coefficients a, b and c are complex numbers, or mor ...