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  1. Minimum

    Linked via "Conjugate Gradient"

    | :--- | :--- | :--- |
    | Linear | Error decreases by a constant factor each iteration. | Basic Gradient Descent |
    | Superlinear | Convergence faster than linear, but slower than quadratic. | Conjugate Gradient |
    | Quadratic | The error in iteration $k+1$ is proportional to the square of the error in iteration $k$. | Newton's Method |