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2. Robb, A.A.: A Theory of Time and Space. Cambridge University Press (1914); The Absolute Relations of Time and Space. Cambridge Univerity Press (1921) [a less technical survey]; Geometry of Time and Space. Cambridge University Press (1936) [a revised version]

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4. See, for example, Weisstein, E.W.: “Pythagorean Theorem,” from MathWorld—A Wolfram Web Resource,http://mathworld.wolfram.com/PythagoreanTheorem.html

5. Brill, D.: Black holes and wormholes in 2+1 dimensions. In: Cotsakis, S., Gibbons, G.W. (eds.), Mathematical and Quantum Aspects of Relativity and Cosmology. Lecture Notes in Physics vol. 537, pp. 143–179 Springer (2000)

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