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Abstract
Let 
. A p-set of equi-isoclinic planes with parameter λ in 
is a set of p planes spanning each pair of which has the same non-zero angle arccos 
. We prove that the maximum number of equi-isoclinic planes in 
is nine and that if λ > ¼, the maximum number of equi-isoclinic planes in 
with parameter λ is equal to that one of equiangular lines in 
with angle arccos .
Received: 2005-10-10
Revised: 2006-11-20
Published Online: 2007-06-28
Published in Print: 2007-07-20
© Walter de Gruyter
