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A Subway Named Mobius

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For a cautionary tale of what could happen if you make your subway system too complex, you might want to read the classic science fiction story, A Subway Named Mobius. Here's one introduction to the story:

The principles of connectivity state that as a system makes more connections to other parts of itself, the connectivity of that system increases in an exponential fashion to staggering levels. The subway under Boston had been growing in complexity for years. It was so complex, in fact, that the best mathematicians could not calculate its connectivity...

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Thanks. I'll read it later. Your little introduction implies that what happens is that it becomes what the math guys call "NP complete" which is a problem that can never be solved in all the time left in the universe.

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