 In 1662 , the book La Logique ou l ’ Art de Penser was published anonymously in Paris . The authors presumably were Antoine Arnauld and Pierre Nicole , two leading Jansenists , who worked together with Blaise Pascal . The Latin title of this book is Ars cogitandi , which was a successful book on logic of the time . The Ars cogitandi consists of four books , with the fourth one dealing with decision @-@ making under uncertainty by considering the analogy to gambling and introducing explicitly the concept of a quantified probability . 
