std::relation - Man Page

#include <concepts>

template<typename _Rel, typename _Tp, typename _Up>
concept std::relation =  predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up>
      && predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp>

[concept.relation], concept relation

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