La formule préférée du professeur

The Housekeeper and the Professor (博士の愛した数式, hakase no ai shita suushiki) (literally "The Professor's Beloved Equation") is a novel by Yōko Ogawa set in modern-day Japan. It was published in Japan in August 2003, by Shinchosha. In 2009, the English translation by Stephen Snyder was published.