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Visual or perceptual space
The validity of geometry The principle of perceptibility
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absolute according Achilles analytical geometry angles arbitrarily assertion basic objects basic relationship Basle Bolyai causal postulate circle classical physics coincide congruence constant coordinate system corresponding curvature curve determined dimensions distance earlier Einstein elementary geometry empirical equal equation Euclid's euclidean geometry euclidean plane euclidean space euclidean system euclidean view events Ex Ex and E2 example experience expression fact Figure finite fixed follows four-dimensional cube frame fundamental Galileian transformations Gauss geodesic given idea infinite number interpretation intersect intuitive isomorphic kinematics later laws length logical Lorentz factor Lorentz transformations mathematical motion natural non-euclidean geometry objects and relationships observations occur parallel postulate phenomena point of view position possible precisely one line projection Pythagoras's theorem relativistic represented respect signal space coordinate space-time spatial standard clock straight line surface theory of relativity three-dimensional space time-ordering tortoise triangle true two-dimensional velocity of light vertices view of space visual space world-line Zurich