GroupsWithPropertyT/AutFN_orbit.jl

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2017-06-08 20:09:27 +02:00
include("Orb_AutFN.jl")
###############################################################################
#
# Action of WreathProductElems on AutGroupElem
#
###############################################################################
function AutFG_emb(A::AutGroup, g::WreathProductElem)
isa(A.objectGroup, FreeGroup) || throw("Not an Aut(Fₙ)")
parent(g).P.n == length(A.objectGroup.gens) || throw("No natural embedding of $(parent(g)) into $A")
powers = [(elt == parent(elt)() ? 0: 1) for elt in g.n.elts]
elt = reduce(*, [A(Groups.flip_autsymbol(i))^pow for (i,pow) in enumerate(powers)])
Groups.r_multiply!(elt, [Groups.perm_autsymbol(g.p)])
return elt
end
function (g::WreathProductElem)(a::AutGroupElem)
g = AutFG_emb(parent(a),g)
return g*a*g^-1
end
###############################################################################
#
# Generating set
#
###############################################################################
function SOutFN_generating_set(N::Int)
SOutFN = AutGroup(FreeGroup(N), special=true, outer=true)
S = generators(SOutFN);
S = [S; [inv(s) for s in S]]
return SOutFN, unique(S)
end
###############################################################################
#
# Parsing command line
#
###############################################################################
function parse_commandline()
settings = ArgParseSettings()
@add_arg_table settings begin
"--tol"
help = "set numerical tolerance for the SDP solver (default: 1e-5)"
arg_type = Float64
default = 1e-5
"--iterations"
help = "set maximal number of iterations for the SDP solver (default: 20000)"
arg_type = Int
default = 20000
"--upper-bound"
help = "Set an upper bound for the spectral gap (default: Inf)"
arg_type = Float64
default = Inf
"--cpus"
help = "Set number of cpus used by solver (default: auto)"
arg_type = Int
required = false
"-N"
help = "Consider automorphisms of free group on N generators (default: N=2)"
arg_type = Int
default = 2
"--radius"
help = "Find the decomposition over B_r(e,S)"
arg_type = Int
default = 2
end
return parse_args(settings)
end
###############################################################################
#
# main
#
###############################################################################
function main()
parsed_args = parse_commandline()
N = parsed_args["N"]
dirname = "SOutF$(N)_E_r=$radius"
radius = parsed_args["radius"]
isdir(dirname) || mkdir(dirname)
logger = PropertyT.setup_logging(dirname)
G, S = SOutFN_generating_set(logger, dirname, N)
info(logger, G)
info(logger, "Symmetric generating set of size $(length(S))")
info(logger, S)
AutS = WreathProduct(Nemo.FiniteField(2,1, "a")[1], PermutationGroup(N))
tol = parsed_args["tol"]
iterations = parsed_args["iterations"]
upper_bound = parsed_args["upper-bound"]
solver = SCS.SCSSolver(eps=tol, max_iters=iterations, verbose=true, linearsolver=SCS.Indirect)
orbit_check_propertyT(logger, dirname, G, S, AutS, solver, upper_bound)
end
main()