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## What is mass?

Mass is the central concept from Newtonian physics.  The fundamental question of what is mass needs to be answered still and insight comes from Einstein’s work.  From my point of view, there should be a geometric answer in a four-sphere universe.  I don’t have an answer but some basic thoughts on the issue.  Consider an orthonormal frame of a three dimensional hypersurface in a scaled 4-sphere. Very vaguely, charge is a feature of the normal and mass is a feature of the geometry of the hypersurface. I am still thinking about what mass is really. I expect there is a simple geometric answer.

Now intuitively, objects in the three dimensional physical submanifold of S4(1/h), say particles, have mass in a form of tension or potential energy they are preserving; this is at least part of the interpretation consistent with the famous relation $E = mc^2$, that is, in order to understand mass, one ‘unravels’ the object and recover a fixed amount of energy.  Thus the idea that physical universe objects with the property of mass telling us the amount of potential energy stored by geometric construction is not completely absurd.

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