A set of objects x1, x2, …, xn (→ vectors, → matrices, → polynomials, etc.) if it si not → linearly dependent.
Of two particular solutions (y1, y2) of a → homogeneous linear differential equation of the second order (y’’ + a1 y’ + a2y = 0) on an interval [a, b], if their ratio in this interval is not a constant: y1/y2≠ constant.
See also: → linearly; → independent.