Dear Sir or Madam: I have difficulty in writing such assertions in Description Logic. At first, I have three assertions, 1: Every Presentation is made by a Person. 2: Every Paper is introduced at a Presentation. 3: Every Paper is (mainly) written by a Person. I can write them in DL as below: But I can not write an assertion to state that 4: Every Paper is introduced at a Presentation by the paper's writer, Sincerely appreciate any suggestion! Cai Shubin
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