Three ships of the United States Navy have borne (and a fourth will
soon bear) the name USS Texas, in honor of Texas, a region that, after being taken from its natives by first Spain and then Mexico, and later becoming an independent republic, was admitted to the United States as the 28th state on December 29, 1845.
... Generalizations
The formula and its proof remain correct if the coefficients a, b and c are complex numbers, or more generally members of any field ...