#Ruth Aaronson Bari
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Ruth Aaronson Bari, regular major maps of at most 19 regions and their Q-chromials
#4-color theorem#graph theory#George David Birkhoff#Bill Tutte#W. H. Tutte#Tutte polynomial#chromatic polynomial#polynomials#algebra#graph colourability#4-colour theorem#sphere#S2#genus zero#surfaces#manifolds#topology#mathematics#maths#math#Birkhoff#G. D. Birkhoff#Ruth Aaronson Bari#Potts model#spinors#spin networks#networks#network theory#connectivity#connectedness
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