qnum.hpp File Reference

Defines packed quantum numbers and same-symmetry quantum-number containers. More...

#include <uni20/symmetry/symmetry.hpp>
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <initializer_list>
#include <stdexcept>
#include <string>
#include <string_view>
#include <utility>
#include <vector>

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Classes
class	uni20::QNum
	One irrep label together with the symmetry context needed to interpret it. More...
class	uni20::QNumList
	Explicit sparse tensor space represented as quantum numbers with one shared symmetry. More...

Namespaces
namespace	std
namespace	uni20

Functions
auto	uni20::coerce (QNum const &q, Symmetry target) -> QNum
	Coerce a quantum number into a related symmetry by named components.
auto	uni20::degree (QNum const &q) -> int
	Return the integral degree of a quantum number.
auto	uni20::dual (QNum const &q) -> QNum
	Return the dual irrep of a quantum number.
auto	uni20::is_identity (QNum const &q) -> bool
	Return whether a quantum number is the identity irrep.
auto	uni20::make_qnum (Symmetry sym, std::initializer_list< std::pair< std::string_view, U1 > > values) -> QNum
	Construct a packed QNum from named U(1) component values.
auto	uni20::operator+ (QNum const &lhs, QNum const &rhs) -> QNum
	Add two quantum numbers when the fusion result is uniquely defined.
auto	uni20::qdim (QNum const &q) -> double
	Return the quantum dimension of a quantum number.
auto	uni20::to_string (QNum const &q) -> std::string
	Format a quantum number as comma-separated named components.
auto	uni20::u1_component (QNum const &q, std::string_view name) -> U1
	Read one named U(1) component from a quantum number.

Detailed Description

Defines packed quantum numbers and same-symmetry quantum-number containers.

See docs/symmetry/qnum.md for the implemented QNum and QNumList API, along with the planned non-abelian, braiding, and coupling-data extensions.