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#pragma once
#include "mod.hpp"
#include "matrix.hpp"
#include "spin.hpp"
#include "vector.hpp"
typedef double Radius;
typedef signed IsingSpin;
template <class T, int D> class Dimer {
public:
double radius;
Vector<T, D> relativePosition;
};
template <class T, int D> class Affine {
protected:
virtual Vector<T, D> actV(const Vector<T, D>& x) const { return t + r * x; }
Affine actA(const Affine& x) const { return Affine(act(x.t), r * x.r); }
public:
Vector<T, D> t;
Matrix<T, D> r;
Affine() {
for (unsigned i = 0; i < D; i++) {
t(i) = 0;
r(i, i) = 1;
for (unsigned j = 1; j < D; j++) {
r(i, (i + j) % D) = 0;
}
}
}
Affine(const Vector<T, D>& t0, const Matrix<T, D>& r0) : t(t0), r(r0) {}
Affine inverse() const { return Affine(-r.transpose() * t, r.transpose()); }
Vector<T, D> act(const Vector<T, D>& x) const { return actV(x); }
Radius act(Radius r) const { return r; }
IsingSpin act(IsingSpin s) const { return s; }
Dimer<T, D> act(const Dimer<T, D>& d) const {
return {.radius = d.radius, .relativePosition = r * d.relativePosition};
}
template <class S> Spin<T, D, S> act(const Spin<T, D, S>& s) const {
return {.x = act(s.x), .s = act(s.s)};
}
};
template <class T, int D> class Euclidean : public Affine<T, D> {
public:
Euclidean(T L = 0) : Affine<T, D>() {}
Euclidean(const Affine<T, D>& a) : Affine<T, D>(a) {}
Euclidean(Vector<T, D> t0, Matrix<T, D> r0) : Affine<T, D>(t0, r0) {}
Euclidean act(const Euclidean& t) const { return Affine<T, D>::actA(t); };
using Affine<T, D>::act;
};
template <class T, int D> class TorusGroup : public Affine<T, D>{
private:
T L;
protected:
Vector<T, D> actV(const Vector<T, D>& s) const override {
Vector<T, D> s_new = Affine<T, D>::actV(s);
for (unsigned i = 0; i < D; i++) {
s_new(i) = mod(s_new(i), L);
}
return s_new;
}
public:
TorusGroup(T L) : Affine<T, D>(), L(L) {}
TorusGroup(T L, Vector<T, D> t0, Matrix<T, D> r0) : Affine<T, D>(), L(L) {}
TorusGroup(T L, const Affine<T, D>& t) : Affine<T, D>(t), L(L) {}
TorusGroup act(const TorusGroup& t) const { return TorusGroup(L, Affine<T, D>::actA(t)); }
TorusGroup inverse() const { return TorusGroup(L, Affine<T, D>::inverse()); }
using Affine<T, D>::act;
};
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