Reciprocity ("Symmetry") Approach to Coin Dragon

TheSir Isaac Newton really loved

- To every action there is an equal and opposite reaction
- The Apple falls towards the Earth, ergo the Earth is falling towards the Apple (The Universal Law of Gravitational Attraction)

From the point of view of the red coin, the blue coin rolls about it until the point of contact has moved through 180 degrees.

But by symmetry

From the point of view of the blue coin, the red coin rolls about it until the point of contact has moved through 180 degrees.

That is, on both coins the point of contact has moved through 180 degrees, so that one coin is sitting on top of the other, both with the same heading as before.

A different turn of phrase is:

that just as the blue coin rolls around through half its circumference to reach the bottom of the red coin, then from the perspective of the blue coin, the red coin is rolling about it through half its circumference, so is now on the opposite of the blue coin to the initial state.

The powerful

For comparison see::

Heuristic Process motivated attack on the Coin Problem | |

Einstein's solution to the Coin Problem | |

Homepage for the Coin Problem | |

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