https://w3id.org/framester/conceptnet5/data/en/p_adic_absolute_value <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/absolute_value.n> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/norm.n.mathematics> risorse dalla linked data cloud