Further problems arise concerning the truth value of statements about fictional worlds and characters that can be implied but are nowhere explicitly stated by the sources for our knowledge about them, such as Sherlock Holmes had only one head or Sherlock Holmes never travelled to the moon.
进一步的问题是关于虚构的世界和人物对于探索真理的价值，它只能被暗示，但并不能明确地陈述他们的知识来源，如福尔摩斯只有一个头或福尔摩斯从未去过月球。