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Researchers propose a mathematical model of marriage: Every Unhappy Family Has Its Own Bilinear Influence Function (Chronicle of Higher Education)

In The Mathematics of Marriage: Dynamic Nonlinear Models (MIT Press), which he wrote in collaboration with four mathematicians, Mr. Gottman uses the tools of calculus to describe the interactions of couples like Angie and Dave. The models presented in the book, he says, offer insights into the heaven and hell of couplehood that he would never have found by sifting through his data with standard linear statistical tools. He has already begun to apply those insights in his therapeutic work -- including with Angie and Dave themselves, whose conversations are transcribed in the book.