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SI S N S i n g . "A modified algorithm for ~nvertihiht> in nonlinear bkztsmr." JE-EE [61 R W . Brm.kett and M. D hiesarob~c. "The rsproducihdit? of mult~~ariabls byten?>." [?I Xi K. Sain and I. L Mas??. "Inkertihiht) of linear lmc-lnvanant d>nam~~aI [X] L. M Silvrrman. "Inversion of multivanahle hncar s?*tem,." I E E E Tram .4~10mur (91 L. M. Sllvmnan and H. I. Payne. "Input-output \tmc'turc of linear >>stems with 7rmu .Auromur. Conrr.,4bsrrucr -This correspondence presents a new operational matrix for "Stretch" via Walsh functions and discusses some interesting properlies of this matrix and its role in the solution of certain functional differential equations. The solutions of differential equations are obtained in a series of Walsh functions. The results are piecewise constant with minimal meansquare error. The single term approximation combined with the technique of extension [SI reduces the computational effort to a minimum.Abstract--A sufficient condition for the inrertibility of n~ultivariable distributed parameter systems described b! partial differential equations of parabolic tvpe ic presented. For invertible ystems. distributed inverse systems are canctructed. An example is worked out.

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