chapter AFP

session "Polygonal_Number_Theorem" = "Three_Squares" +
  options [timeout = 600]

  theories
    "Polygonal_Number_Theorem_Lemmas"
    "Polygonal_Number_Theorem_Gauss"
    "Polygonal_Number_Theorem_Cauchy"
    "Polygonal_Number_Theorem_Legendre"

  document_files
    "root.tex"
    "root.bib"