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https://github.com/kalmarek/Groups.jl.git
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general cleanup
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b125871697
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@ -28,35 +28,29 @@ export FPGroupElem, FPGroup
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#
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# Type and parent object methods
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#
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###############################################################################
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elem_type(::Type{FPGroup}) = FPGroupElem
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parent_type(::Type{FPGroupElem}) = FPGroup
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AbstractAlgebra.elem_type(::Type{FPGroup}) = FPGroupElem
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AbstractAlgebra.parent_type(::Type{FPGroupElem}) = FPGroup
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###############################################################################
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#
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# FPSymbol constructors
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#
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###############################################################################
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FPSymbol(s::Symbol) = FPSymbol(s, 1)
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FPSymbol(s::String) = FPSymbol(Symbol(s))
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FPSymbol(s::GSymbol) = FPSymbol(s.id, s.pow)
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convert(::Type{FPSymbol}, s::FreeSymbol) = FPSymbol(s.id, s.pow)
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FPGroup(n::Int, symbol::String="f") = FPGroup([Symbol(symbol,i) for i in 1:n])
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FPGroup(a::AbstractVector) = FPGroup([FPSymbol(i) for i in a])
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FPGroup(gens::Vector{FPSymbol}) = FPGroup(gens, Dict{FreeGroupElem, FreeGroupElem}())
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FPGroup(a::Vector{String}) = FPGroup([FPSymbol(i) for i in a])
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FPGroup(n::Int, symbol::String="f") = FPGroup(["$symbol$i" for i in 1:n])
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FPGroup(H::FreeGroup) = FPGroup([FPSymbol(s) for s in H.gens])
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###############################################################################
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#
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# Parent object call overloads
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#
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###############################################################################
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function (G::FPGroup)(w::GWord)
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if isempty(w)
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@ -80,48 +74,23 @@ function (G::FPGroup)(w::GWord)
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return reduce!(w)
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end
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###############################################################################
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#
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# Basic manipulation
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#
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###############################################################################
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(G::FPGroup)(s::GSymbol) = G(FPGroupElem(s))
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###############################################################################
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#
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# String I/O
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#
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###############################################################################
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function show(io::IO, G::FPGroup)
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print(io, "FPgroup on $(length(G.gens)) generators ")
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strrels = join(G.rels, ", ")
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if length(strrels) > 300
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print(io, "⟨ ", join(G.gens, ", "), " | $(length(G.rels)) relation(s) ⟩.")
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else
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print(io, "⟨ ", join(G.gens, ", "), " | ", join(G.rels, ", "), " ⟩.")
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end
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print(io, "FPgroup on $(length(G.gens)) generators ")
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strrels = join(G.rels, ", ")
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if length(strrels) > 200
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print(io, "⟨ ", join(G.gens, ", "), " | $(length(G.rels)) relation(s) ⟩.")
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else
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print(io, "⟨ ", join(G.gens, ", "), " | ", join(G.rels, ", "), " ⟩.")
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end
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end
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###############################################################################
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#
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# Comparison
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#
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###############################################################################
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###############################################################################
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#
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# Inversion
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#
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###############################################################################
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###############################################################################
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#
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# Binary operations
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#
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###############################################################################
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function reduce!(W::FPGroupElem)
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reduced = false
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while !reduced
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@ -2,7 +2,6 @@
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#
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# FreeSymbol/FreeGroupElem/FreeGroup definition
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#
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###############################################################################
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struct FreeSymbol <: GSymbol
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id::Symbol
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@ -14,7 +13,7 @@ FreeGroupElem = GroupWord{FreeSymbol}
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mutable struct FreeGroup <: AbstractFPGroup
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gens::Vector{FreeSymbol}
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function FreeGroup(gens::Vector{T}) where {T<:GSymbol}
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function FreeGroup(gens::AbstractVector{T}) where {T<:GSymbol}
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G = new(gens)
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G.gens = gens
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return G
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@ -27,72 +26,48 @@ export FreeGroupElem, FreeGroup
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#
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# Type and parent object methods
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#
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###############################################################################
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elem_type(::Type{FreeGroup}) = FreeGroupElem
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parent_type(::Type{FreeGroupElem}) = FreeGroup
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AbstractAlgebra.elem_type(::Type{FreeGroup}) = FreeGroupElem
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AbstractAlgebra.parent_type(::Type{FreeGroupElem}) = FreeGroup
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###############################################################################
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#
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# FreeSymbol constructors
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#
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###############################################################################
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FreeSymbol(s::Symbol) = FreeSymbol(s,1)
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FreeSymbol(s::String) = FreeSymbol(Symbol(s))
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FreeSymbol(s::AbstractString) = FreeSymbol(Symbol(s))
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FreeSymbol(s::GSymbol) = FreeSymbol(s.id, s.pow)
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FreeGroup(n::Int, symbol::String="f") = FreeGroup([Symbol(symbol,i) for i in 1:n])
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FreeGroup(a::Vector) = FreeGroup(FreeSymbol.(a))
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FreeGroup(a::AbstractVector) = FreeGroup(FreeSymbol.(a))
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###############################################################################
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#
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# Parent object call overloads
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#
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###############################################################################
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function (G::FreeGroup)(w::GroupWord{FreeSymbol})
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if length(syllables(w)) > 0
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for s in w.symbols
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i = findfirst(g -> g.id == s.id, G.gens)
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i == 0 && throw(DomainError(
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"Symbol $s does not belong to $G."))
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s.pow % G.gens[i].pow == 0 || throw(DomainError(
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"Symbol $s doesn't belong to $G."))
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end
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for s in syllables(w)
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i = findfirst(g -> g.id == s.id, G.gens)
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isnothing(i) && throw(DomainError(
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"Symbol $s does not belong to $G."))
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s.pow % G.gens[i].pow == 0 || throw(DomainError(
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"Symbol $s doesn't belong to $G."))
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end
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w.parent = G
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return w
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setparent!(w, G)
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return reduce!(w)
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end
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(G::FreeGroup)(s::FreeSymbol) = G(FreeGroupElem(s))
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###############################################################################
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#
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# Basic manipulation
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#
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###############################################################################
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(G::FreeGroup)(s::GSymbol) = G(FreeGroupElem(s))
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(G::FreeGroup)(v::AbstractVector{<:GSymbol}) = G(FreeGroupElem(FreeSymbol.(v)))
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###############################################################################
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#
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# String I/O
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#
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###############################################################################
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function show(io::IO, G::FreeGroup)
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print(io, "Free group on $(length(G.gens)) generators: ")
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join(io, G.gens, ", ")
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end
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###############################################################################
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#
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# Comparison
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#
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###############################################################################
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###############################################################################
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#
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# Inversion
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#
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###############################################################################
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@ -15,7 +15,12 @@ using Markdown
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include("types.jl")
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include("gsymbols.jl")
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include("FreeGroup.jl")
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include("FPGroups.jl")
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include("AutGroup.jl")
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include("symbols.jl")
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include("fallbacks.jl")
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include("words.jl")
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include("hashing.jl")
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@ -23,51 +28,33 @@ include("freereduce.jl")
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include("arithmetic.jl")
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include("findreplace.jl")
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include("FreeGroup.jl")
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include("FPGroups.jl")
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include("AutGroup.jl")
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include("DirectPower.jl")
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include("WreathProducts.jl")
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@doc doc"""
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gens(G::AbstractFPGroups)
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> returns vector of generators of `G`, as its elements.
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"""
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gens(G::AbstractFPGroup) = [G(g) for g in G.gens]
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###############################################################################
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#
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# String I/O
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#
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###############################################################################
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@doc doc"""
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show(io::IO, W::GWord)
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> The actual string produced by show depends on the eltype of `W.symbols`.
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"""
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function show(io::IO, W::GWord)
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function Base.show(io::IO, W::GWord)
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if length(W) == 0
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print(io, "(id)")
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else
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join(io, [string(s) for s in W.symbols], "*")
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join(io, (string(s) for s in syllables(W)), "*")
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end
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end
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function show(io::IO, s::T) where {T<:GSymbol}
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if s.pow == 1
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print(io, string(s.id))
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else
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print(io, string((s.id))*"^$(s.pow)")
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end
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end
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function Base.show(io::IO, s::T) where {T<:GSymbol}
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if s.pow == 1
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print(io, string(s.id))
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else
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G = parent(W)
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w = T([inv(s) for s in Iterators.reverse(syllables(W))])
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return G(w)
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print(io, "$(s.id)^$(s.pow)")
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end
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end
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