The Meaning of Relativity: Four Lectures Delivered at Princeton University, May, 1921 (Classic Reprint) Paperback -

I shall not go into detail concerning those properties Of the space of reference which lead to our conceiving points as elements of space, and space as a continuum. Nor shall I attempt to analyse further the properties Of space which justify the conception of continuous series Of points, or lines. If these concepts are assumed, together with their relation to the solid bodies Of experience, then it is easy to say what we mean by the three-dimensionality of space; to each point three numbers, 13, x2, x3 (co ordinates), may be associated, in such a way that this association is uniquely reciprocal, and that 43, x2, and x3 vary continuously when the point describes a continuous series Of points (a line).

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