2012 ◽  
Vol 11 (03) ◽  
pp. 1250057 ◽  
Author(s):  
SAEID AZAM ◽  
MALIHE YOUSOSFZADEH

We study a combinatorial approach of producing new root systems from the old ones in the context of affine root systems and their new generalizations. The appearance of this approach in the literature goes back to the outstanding work of Kac in the realization of affine Kac–Moody Lie algebras. In recent years, this approach has been appeared in many other works, including the study of affinization of extended affine Lie algebras and invariant affine reflection algebras.


1998 ◽  
Vol 205 (1) ◽  
pp. 207-226 ◽  
Author(s):  
Paola Cellini ◽  
Paolo Papi

1995 ◽  
Vol 172 (3) ◽  
pp. 613-623 ◽  
Author(s):  
P. Papi

2001 ◽  
Vol 102-103 ◽  
pp. 311-315
Author(s):  
I.V. Kostyakov ◽  
N.A. Gromov ◽  
V.V. Kuratov

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