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Sign in to saveresearch program on the symmetries of geometry
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Euclidean geometry
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non-Euclidean geometry
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groupoid
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Charles Ehresmann
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physics
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geometry
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Euclid
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International Standard Book Number
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circle
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complex number
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angle
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topology
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digital object identifier
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symmetry
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Jean Piaget
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mathematical logic
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group
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dimension
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group theory
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conic section
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