title: Encoding mathematical properties in RDF
body: <p>I have been trying to find a solution to adding relationships, such as <strong>X</strong> has unit <strong>A &lt; 20</strong> into an existing ontology, but, could not find a solution so far.</p>
  
  <p>An existing knowledge graph - <code>RDF</code> - has many concepts and relationships. In an attempt improve the accuracy of inferences, we are trying to add some key properties to few of the concepts.</p>
  
  <p><strong>Example:</strong> </p>
  
  <p><em>Concept X causes concept Y. And, we now know that concept Y has property ABC &lt; 30 always.</em></p>
  
  <p>Please suggest on how to add this kind of relationships for only few concepts in a knowledge graph - <code>RDF</code></p>