Now I make simple "virtual" Metropolis of Tokyo in my computer, and "virtual" trains are running on several "virtual" lines.

At the "virtual" Metropolis of Tokyo, I prepare hundreds of thousand of "virtual" citizens and try to make a easy "virtual" transshipment service for their "virtual" smart-phone.

This time, I have implemented "Dijkstra method", that can resolve a shortest path problem with shortest-processing-time.

To tell you the truth, I have just embeded an open source in the Internet to my simulation program.

Just inputting the station numbers of both a departure and an arrival, the program output the a shortest path of a "virtual" citizen immediately. However I felt that

"It is beautiful"

I was fascinated with watching the process.

-----

A few weeks ago, when I watch a program, so called "variety show" on the TV,

I was shocked to know that most of the performer didn't know the words of "Pythagorean theorem". Even some of them know the words, they cannot understand the contents.

We all Japanese, should be taught "Pythagorean theorem" at junior high school. I am afraid that "disgust (or hate) against Math." shows in true colors.

Of course, I know that each of us has our own background.

Without cosine / sine theorem, vector inner product calculation, equation of motion, and calculation of impulse, I can not create "virtual Tokyo" in my computer.

Numbers and mathematics are an indispensable tool for me to make a decent living.

If you are involved in making things, I think that we are in the same situation.

"Pythagorean theorem" is the basic form of the sine / cosine theorem, and "How can we understand the world without understanding this theorem? "

I who come to think it, is probably,

in the minority

(To be continued)