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
.



















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