Check conditions such as ∣f(xn)∣<ϵ|f(x_n)| < \epsilon∣f(xn)∣<ϵ, ∣xn+1−xn∣<ϵ|x_{n+1} - x_n| < \epsilon∣xn+1−xn∣<ϵ, or maximum iterations.
