Frank P. Russo
P.O. Box 90 Campbelltown 5074 South Australia
Actually I am getting a bit rusty because I didn't explain the visualization all that well! There ends up being a Va) at the start of the interval and one at the end: the first one moves the origin forward and the second one moves the endpoint forward. However, what I said still goes because by moving the endpoint forward you tend to stretch the interval.
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