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cross-ratio▼◼◼◼(a special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations)noun[UK: ˈkrɒs ˈreɪ.ʃɪəʊ] [US: ˈkrɑːs ˈreɪ.ʃiˌo.ʊ]
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