I want to know the answer to the following question:
Roger Bacon,Walter Burley and Blasius of Parma were from what century?
All the background I'm provided with is that "Although Lucretius argued for the existence of vacuum in the first century BC and Hero of Alexandria tried unsuccessfully to create an artificial vacuum in the first century AD, it was European scholars such as Roger Bacon, Blasius of Parma and Walter Burley in the 13th and 14th century who focused considerable attention on these issues.". Is that enough to answer the question?