Contents Preface List o f Contributor s Calculus o f Variations: Wha t Doe s "Variations " Mean ? Frank Jone s How Man y Equilibri a Ar e There ? A n Introductio n t o Mors e Theory Robin Forma n Aye, There' s th e Rub . A n Inquir y int o Wh y a Plucke d Strin g Comes t o Res t Steven J . Co x Proof o f the Doubl e Bubbl e Conjectur e Frank Morga n Minimal Surfaces , Fla t Con e Sphere s an d Modul i Space s o f Staircases Michael Wol f Hold Tha t Light ! Modelin g o f Traffi c Flo w b y Differentia l Equations Barbara Le e Keyfit z

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