zero of a function
element of the domain where function's value is zero
zero crossing
point where a function crosses an axis and changes sign
null vector
zero of quadratic form of vectors
Bring radical
(of a real number a) unique real root of the polynomial x^5+x+a
polynomial root
value of the argument of a polynomial at which the polynomial evaluates to zero
zero
of a holomorphic function in complex analysis
root of unity
complex number whose positive integer power equals one