Function sequant::mbpt::detail::descending_rank_pairs¶

Defined in File op.hpp

Function Documentation¶

inline container::svector<std::pair<std::int64_t, std::int64_t>> sequant::mbpt::detail::descending_rank_pairs(std::int64_t n1, std::int64_t n2)¶

the rank pairs of a sum of operators truncated at ranks (n1, n2), highest first

Returns:: (n1, n2), (n1-1, n2-1), ..., stopping before (0, 0) and after the first pair with a zero entry