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The illustration (a) on the left shows a graph plotting V of t versus t where a rectangular pulse of amplitude V of 0 is shown over a duration, tau. Illustration (b) on the right shows another graph of V of t versus t. Two-step functions are plotted with opposite polarities. The positive step function represented by V sub 1 of t equals V sub 0 times u of t, steps up from the negative x-axis to V sub 0 on the vertical axis. The negative step function represented by V sub 2 of t equals negative V sub 0 times u of (t minus tau), steps down at t equals tau to negative V sub 0. The sum of the two functions is shown as V of t equals V sub 1 of t plus V sub 2 of t.