upon his final return to turkey, he joined the mathematics department of the middle east technical university and continued his studies there until his retirement in 1980. arf received numerous awards for his contributions to mathematics, among them are: i̇nönü award in 1948, scientific and technological research council of turkey (tübi̇tak) science award in 1974, and commandeur des palmes academiques (france) in 1994. arf was a member of the mainz academy and the turkish academy of sciences. he was the president of the turkish mathematical society from 1985 until 1989. arf died on december 26, 1997 in bebek, istanbul, at the age of 87. his collected works were published, in 1988, by the turkish mathematical society.