In the comments to my post on Bacon numbers below, I noted that my Erdős number was 8, but then revised it to 6. Here's what I previously thought my chain was:

P. Erdos, C.D. Godsil, S.G. Krantz & T.D. Parsons,

*Intersection graphs for families of balls in R^n*, European J. Combin. 9 (1988), no. 5, 501-505.Steven G. Krantz & Norberto Salinas,

*Proper holomorphic mappings and the Cowen-Douglas class*, Proc. Amer. Math. Soc. 117 (1993), no. 1, 99-105.Gregory T. Adams, Paul J. McGuire, Norberto Salinas & Allen R. Schweinsberg,

*Analytic finite band width reproducing kernels and operator weighted shifts*, J. Operator Theory 51 (2004), no. 1, 35-48.Ariel Pakes & Paul McGuire,

*Stochastic algorithms, symmetric Markov perfect equilibrium, and the "curse" of dimensionality*, Econometrica 69 (2001), no. 5, 1261-1281.Laurence J. Kotlikoff, & Ariel Pakes,

*Looking for the news in the noise. Additional stochastic implications of optimal consumption choice*, Ann. Econom. Statist. 1988, no. 9, 29-46.Laurence J. Kotlikoff & Lawrence H. Summers,

*Tax incidence*, Handbook of public economics, Vol. II, 1043-1092, Handbooks in Econom., 4, North-Holland, Amsterdam, 1987.B. De Long, A. Shleifer, L. Summers & R. Waldmann,

*Noise Trader Risk in Financial Markets*, Journal of Political Economy, August 1990, reprinted in Richard H. Thaler, ed., Advances in Behavioral Finance, Russell Sage Foundation, 1993.Juan Carlos Botero, Rafael La Porta, Florencio López-de-Silanes, Andrei Shleifer & Alexander Volokh,

*Judicial Reform*, World Bank Research Observer 18 (2003), no. 1, pp. 61-88.

This took us through my industrial organization professor Ariel Pakes, former Harvard president Larry Summers, and my adviser Andrei Shleifer. But yesterday I discovered a new chain, of length 6 instead of 8, through Shechao Charles Feng, my one-time co-author on an L.A. Times op-ed on affirmative action, later reprinted in the *Journal of Blacks in Higher Education*, once of the UCLA Physics Department:

P. Erdős, A. Rényi & V.T. Sós,

*On a problem of graph theory*, Studia Sci. Math. Hungar. 1 (1966), pp. 215-235.Christian Borgs, Jennifer Chayes, László Lovász, Vera T. Sós & Katalin Vesztergombi,

*Counting graph homomorphisms*, Algorithms Combin. 26 (2006), pp. 315-371.J.T. Chayes, L. Chayes, Daniel S. Fisher & T. Spencer,

*Finite-Size Scaling and Correlation Lengths for Disordered Systems*, Phys. Rev. Letters 57 (1986), no. 24, pp. 2999-3002.Daniel S. Fisher & Patrick A. Lee,

*Relation between conductivity and transmission matrix*, Phys. Rev. B 23 (1981), no. 12, pp. 6851-6854.Shechao Feng & Patrick A. Lee,

*Mesoscopic Conductors and Correlations in Laser Speckle Patterns*, Science 251 (9 Feb. 1991), pp. 633-639.Alexander Volokh & Shechao Charles Feng,

*How Race Adds Up for UCLA Entry*, L.A. Times (18 July 1995), partly reprinted in Journal of Blacks in Higher Education 9 (Autumn 1995), p. 94.

And just today I accidentally discovered an even shorter chain, again going through economists -- through my adviser Shleifer and my former economics professors Oliver Hart and Eric Maskin -- which gives me an Erdős number of 5!

Paul Erdős, Peter Fishburn & Zoltán Füredi,

*Midpoints of diagonals of convex n-gons*, SIAM J. Discrete Math. 4 (1991), no. 3, pp. 329-341Peter C. Fishburn, William V. Gehrlein & Eric Maskin,

*A progress report on Kelly's majority conjectures*, Econom. Lett. 2 (1979), no. 4, pp. 313-314.Sanford J. Grossman, Oliver D. Hart & Eric S. Maskin,

*Unemployment with Observable Aggregate Shocks*, J. Polit. Econ. 91 (1983), no. 6, pp. 907-928.Oliver Hart, Andrei Shleifer & Robert W. Vishny,

*The Proper Scope of Government: Theory and an Application to Prisons*, Q.J. Econ. 112 (1997), no. 4, pp. 1127-1161.Juan Carlos Botero, Rafael La Porta, Florencio López-de-Silanes, Andrei Shleifer & Alexander Volokh,

*Judicial Reform*, World Bank Research Observer 18 (2003), no. 1, pp. 61-88.

I know what you're thinking: What's Eugene's Erdős number? If you consider the blog to be a co-authored work, then Eugene could be a 6. On the other hand, if you consider the blog to be a journal where each post is a separate article -- so Eugene and I haven't co-authored anything -- then Eugene might be a 7, because I've co-authored with Judge Kozinski (*The Appeal*, 103 Mich. L. Rev. 1391 (2005)), and so has Eugene (*Lawsuit, Shmawsuit*, 103 Yale L.J. 463 (1993)). Or Eugene's number might be lower through his co-authorship with, say, Larry Lessig.

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