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| Many buses in Japan have a unique way to determine the price of your trip. This electronic board displays the price as a function of the distance travelled (the upper fixed number appears on the ticket you receive when boarding, the changing number is the price, changing as you travel). A wonderful real world example for a mathematical functions. As the trip procedes, new functions are obtained, so here one has also an example of a family of functions unfolding in front of your eyes! |