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| interaction = [[Electromagnetism]], [[Gravitation]], [[Strong interaction|Strong]], [[Weak interaction|Weak] ...four [[fundamental interaction]]s, also known as ''fundamental forces'' ([[electromagnetism]], [[gravitation]], [[strong interaction]], and [[weak interaction]]), as w ...

| interaction = [[Electromagnetism|Electromagnetic]] ...and its direction of propagation. The photon is the [[gauge boson]] for [[electromagnetism]],<ref>Role as gauge boson and polarization section 5.1 in ...

...motions of bodies and making allowances for the external forces (such as [[electromagnetism]] or [[friction]]), can be used to define the geometry of space, as well as ...ivity hold—that theory is based on the propagation of light, and thus on [[electromagnetism]], which could have a different set of preferred frames. But using differe ...