Geometric Ruzsa triangle inequality in metric spaces with dilations
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math.MG
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inequalitydilationsgeometricmetricplaneruzsaspacestriangle
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The Appendix of the article arXiv:1212.5056 [math.CO] "On growth in an abstract plane" by Nick Gill, H. A. Helfgott, Misha Rudnev, contains a general "geometric Ruzsa triangle inequality" in a Desarguesian projective plane. The purpose of this note is to give a similar inequality for metric spaces with dilations, that is in the absence of an algebraic or incidence structure.
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