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要約（サマリー）

In the New theory of gravitation, two children are born from one mother. It is gravity and an electromagnetism. Here, the mysterious mechanism will be revealed now. In the General relativity, a metric is used as mathematical expression of the gravity. However, there is a leap there. Like a rabbit and a tortoise, a metric does not resemble gravity. The consideration of Mach is very significant. If we want to just use the Equivalence principle,... Rather it will be an local inertia coordinate than a metric that is good for expression of gravity. We define 'point-coordinate-systems' as a mathematical expression of the local inertia coordinate. The way of a new gravity theory opened out hereby. On the other hand, we define 'light-cone'. A new mathematical model of space-time is made by this 'point-coordinate-systems' and 'light-cone'. An interesting vector $A_i$ appears when we define a light-ray on this model. This $A_i$ will behave like a vector potential of Electromagnetism.

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