Abstract
A permutation group 𝐺 acting on a set Ω induces a permutation action on the power set
P
(
Ω
)
\mathscr{P}(\Omega)
(the set of all subsets of Ω).
Let 𝐺 be a finite permutation group of degree 𝑛, and let
s
(
G
)
s(G)
denote the number of orbits of 𝐺 on
P
(
Ω
)
\mathscr{P}(\Omega)
.
In this paper, we give the explicit lower bound of
log
2
s
(
G
)
/
log
2
|
G
|
\log_{2}s(G)/{\log_{2}\lvert G\rvert}
over all solvable groups 𝐺.
As applications, we first give an explicit bound of a result of Keller for estimating the number of conjugacy classes, and then we combine it with the McKay conjecture to estimate the number of
p
′
p^{\prime}
-degree irreducible representations of a solvable group.