### L-Infinity Norm of Derivative Objective

We can add a smoothness objective by adding -norm of the derivative to the objective function.

 (4.79)

The -norm only cares about the maximum derivative. Large means we put more weight on the smoothness than the side-lobe level.

This can be formulated as an LP by adding one optimization parameter which bounds all derivatives.

 (4.80)

In matrix form,

Objective function becomes

 (4.81)

The result of adding the Chebyshev norm of diff(h) to the objective function to be minimized ( ) is shown in Fig.3.39. The result of increasing to 20 is shown in Fig.3.40.

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