Which condition guarantees convergence for both Jacobi and Gauss-Seidel methods for solving Ax=b?

Question

Which condition guarantees convergence for  both  Jacobi and Gauss-Seidel methods for solving Ax=b?

Answer

A is symmetric positive definite.

Answer

A is strictly diagonally dominant.

Answer

The spectral radius of the iteration matrix ρ(T)<1

Answer

A is tridiagonal.

Answer

A has no zero diagonal elements.

Crowdly