Man pages matching name rdf::trine::node::formula in section 3pm:

RDF::Trine::Node::Formula.3pm.en	debian 10 / librdf-trin3-perl
RDF::Trine::Node::Formula.3pm.en	debian 11 / librdf-trin3-perl
RDF::Trine::Node::Formula.3pm.en	debian 12 / librdf-trin3-perl