https://w3id.org/framester/conceptnet5/data/en/algebraic_number <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/number.n> <https://w3id.org/framester/conceptnet5/data/en/algebraic.a.of_a_number> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/real_number> risorse dalla linked data cloud