Erdős numbers have been a part of the folklore of mathematicians throughout the world for many years. See Jerry Grossman - The Erdős Number Project for more details.
My Erdős number is 3.
My Erdős number is 3, as given by one of following sets of publications:
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Li, S.-Y.; Son, D.N.; Wang, X.: A new characterization of the CR sphere and the sharp eigenvalue estimate for the Kohn Laplacian. Adv. Math., Vol. 281 (2015) 1285–1305.
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Krantz, S. G.; Li, S.-Y.: Boundedness and compactness of integral operators on spaces of homogeneous type and applications. I. J. Math. Anal. Appl. 258 (2001), no. 2, 629–641.
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Erdős, P.; Godsil, C. D.; Krantz, S. G.; Parsons, T. D.: Intersection graphs for families of balls in Rn. European J. Combin. 9 (1988), no. 5, 501–505.
and
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Ebenfelt, P.; Son, D.N.: CR transversality of holomorphic mappings between generic submanifolds in complex spaces. Proc. Amer. Math. Soc., Vol. 140, no. 5 (2012) 1729–1738.
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Ebenfelt, P.; Khavinson, D.; Shapiro, H. S.: A free boundary problem related to single-layer potentials. Ann. Acad. Sci. Fenn. Math. 27 (2002), no. 1, 21–46.
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Erdős, P.; Shapiro, H. S.; Shields, A. L.: Large and small subspaces of Hilbert space. Michigan Math. J. 12 (1965), 169–178.