claim: Pythagoras was an Ionian Greek person who used an extensive knowledge of mathematics in his work.
evidence: The Mask of Cthulhu is a collection of fantasy and horror short stories by author August Derleth .. August Derleth. August Derleth. short stories. short stories. fantasy. Fantasy fiction. horror. Horror fiction. It was released in 1958 by Arkham House in an edition of 2,051 copies .. Arkham House. Arkham House. 1958 in literature. The stories are part of the Cthulhu Mythos and most had appeared in the magazine Weird Tales between 1939 and 1953 .. Cthulhu Mythos. Cthulhu Mythos. Weird Tales. Weird Tales