"Mathematics" inside story "the mathematician Descartes love story. Descartes was born in France in 1596, the outbreak of bubonic plague in Europe when he wandered to Sweden, in 1956, the streets of Stockholm, Descartes met 52 year old 18 year old Swedish Princess Kristen. A few days later, he accidentally received a notice, the king hired the math teacher him little princess. Follow to notify the guard came to the palace, he saw the encounter in the streets. Since then, he's a math teacher on the little princess. The little princess, make a spurt of progress in Mathematics under the guidance of Descartes, Descartes introduced his new field of study -- Cartesian coordinates to her. Every day to get along with each other so they follow like a shadow with admiration, the princess's father the king knew the fly, ordered Descartes killed, little princess Kristen begged, king he exiled to France, Princess Kristen was placed under house arrest. Descartes back to France soon after the sick, he every day to write by the princess, King interception, Kristen has not received a letter from Descartes. Descartes was sent thirteenth letters to Kristen after he died, the thirteenth letter is only one formula only: r=a (1-sin theta). The king cannot read, think they are not always say sweet words, will the mathematician summoned to the palace, but no one can unlock, he cannot bear to see a beloved daughter feel depressed all day, just give this letter to always feel depressed Kristen, Princess see, immediately clear intention of her lover, to draw the graph of an equation, see figure, she was very happy, she knew that love still love her, the original graph of an equation is a heart shape. This is the famous "heart-shaped line". When the king died, Kristen became king, immediately sent in Europe around looking for a sweetheart, no mal, deceased, her first step away, leaving her alone in the world... It is said that this letter of world-renowned offbeat love letter was stored in memorial of Descartes in europe
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