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Question 4.RQ.13: Give the substitution in the discrete operator z for the Lap...

Give the substitution in the discrete operator z for the Laplace operator s if the approximation to the integral in Eq. (4.98) is taken to be the rectangle of height e(kT_s) and base T_s.

≅ u_I(kT_s) + k_I \frac{T_s}{2}\left\{ {e(kT_s + T_s) + e(kT_s)}\right\} .                 (4.98)

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