gives the number of real roots of the univariate function f in x.
gives the number of roots between a and b.
Examplesopen allclose all
Basic Examples (4)
Basic Uses (8)
Real Elementary Functions (6)
Holomorphic Functions (3)
Meromorphic Functions (3)
Use FindRoot to approximate the root:
Test stability of equilibria at 0 of linear dynamical systems by counting the roots of the CharacteristicPolynomial[m,x] in the right half-plane:
Properties & Relations (5)
Use Reduce to find polynomial roots:
Use RootIntervals to find isolating intervals for roots:
Use NumberFieldSignature to count the real roots and the pairs of complex roots of a polynomial: