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Similar

J. Mago, A. Schreiber, M. Spradlin and A. Volovich, “Symbol alphabets from plabic graphs,” JHEP 10
Original
2007
Cited alongside, same era.
S. He and Z. Li, “A Note on Letters of Yangian Invariants,” [arXiv:2007.01574 [hep-th]]
Original
2007
Cited alongside, same era.
S. Fomin, L. Williams, A. Zelevinsky, “Introduction to Cluster Algebras. Chapters 1-3,” [arXiv:1608.05735 [math.CO]]; “Introduction to Cluster Algebras. Chapters 4-5,” [arXiv:1707.07190 [math.CO]]; “Introduction to Cluster Algebras. Chapter 6,” [arXiv:2008.09189 [math.AC]]
Original
2008
Cited alongside, same era.
S. He, Z. Li and C. Zhang, “The symbol and alphabet of two-loop NMHV amplitudes from Q ¯ \bar{Q} equations,” [arXiv:2009.11471 [hep-th]]
Original
2009
Cited alongside, same era.
L. Mason and D. Skinner, “Dual Superconformal Invariance, Momentum Twistors and Grassmannians,” JHEP 11

Then

D. Chicherin, J. M. Henn and G. Papathanasiou, “Cluster algebras for Feynman integrals,” [arXiv:2012.12285 [hep-th]]
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2012
Later among the works it cites.
A. Hodges, “Eliminating spurious poles from gauge-theoretic amplitudes,” JHEP 05
Original
2013
Later among the works it cites.
J. Golden, A. B. Goncharov, M. Spradlin, C. Vergu and A. Volovich, “Motivic Amplitudes and Cluster Coordinates,” JHEP 01
Original
2014
Later among the works it cites.
M. F. Paulos and B. U. W. Schwab, “Cluster Algebras and the Positive Grassmannian,” JHEP 10
Original
2014
Later among the works it cites.
T. Dennen, M. Spradlin and A. Volovich, “Landau Singularities and Symbology: One- and Two-loop MHV Amplitudes in SYM Theory,” JHEP 03

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2020

Symbol Alphabets from Plabic Graphs II: Rational Letters

Mago, Jorge, Schreiber, Anders, Spradlin, Marcus et al.

Understand

Symbol alphabets of n-particle amplitudes in N=4 super-Yang-Mills theory are known to contain certain cluster variables of Gr(4,n) as well as certain algebraic functions of cluster variables.

The first paper arXiv:2007.00646 in this series focused on n=8 algebraic letters.
In this paper we show that it is possible to obtain all rational symbol letters (in fact all cluster variables) by solving matrix equations of the form C Z = 0 if one allows C to be an arbitrary cluster parameterization of the top cell of Gr_+(n-4,n).