108 ANALYTICAL TREATMENT OF THE POLYTOPES REGULARLY. 



régalant j traction - 



Remark. Only the HM n itself admits a regularity fraction 



Zi 71 



all the I/mpd. derived from it a fraction 



2n 



7 

 As a rule the net NH n admits the fraction — — — — and a net 



2(#-|-l) 



derived from it 



2(«+l) 



Groningen, December, 1912 



