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add subgroup

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This commit is contained in:
David Allemang
2020-01-07 23:06:48 -05:00
parent dc1ced7dcc
commit 462ebf7c25
4 changed files with 38 additions and 13 deletions
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18
include/tc/core.hpp
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@@ -6,15 +6,14 @@
namespace tc {
struct Action {
int coset = -1;
int from_idx = -1;
int gen = -1;
int target = -1;
Action() = default;
Action(const Action &) = default;
Action(int coset, int gen, int target);
Action(int from_idx, int gen);
};
struct Cosets {
@@ -52,6 +51,8 @@ namespace tc {
[[nodiscard]] Rel shift(int off) const;
};
struct SubGroup;
struct Group {
const int ngens;
std::vector<std::vector<int>> _mults;
@@ -67,11 +68,20 @@ namespace tc {
[[nodiscard]] std::vector<Rel> rels() const;
[[nodiscard]] SubGroup subgroup(const std::vector<int> &gens) const;
[[nodiscard]] Group product(const Group &other) const;
[[nodiscard]] Group power(int p) const;
[[nodiscard]] Cosets solve(const std::vector<int>& sub_gens = {}) const;
[[nodiscard]] Cosets solve(const std::vector<int> &sub_gens = {}) const;
};
struct SubGroup : public Group {
const std::vector<int> gen_map;
const Group &parent;
SubGroup(const Group &parent, const std::vector<int> &gen_map);
};
Group operator*(const Group &g, const Group &h);