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...space and time as independent dimensions, but treats both as features of [[space-time]] – a conception that challenges intuitive notions of distance and ti ...Gottfried Leibniz]] (space is relational), and [[Henri Poincaré]] (spatial geometry is a convention). Two important thought-experiments connected with these qu

...ds to a new set of equations of [[motion]] and the result that [[Spacetime|space-time]] is curved by the [[presence]] of gravitational fields. ...purely geometrical [[method]]s. For two millennia, the study of Euclidean geometry made no use of coordinate systems or of [[number]]s. The introduction of [[