Can we trust without any reliable truth information? Most trust architectures work in a similar way: a trustor makes some observations, rates the trustee, and makes recommendations to his friends. When he faces a new case, he checks his trust table and uses recommendations given by trustworthy friends to decide whether he will undertake a given action. But what if the observations that are used...

We study an investor’s optimal consumption and portfolio choice problem when he confronts with two possibly misspecified submodels of stock returns: one with IID returns and the other with predictability. We adopt a generalized recursive ambiguity model to accommodate the investor’s aversion to model uncertainty. The investor deals with specification doubts by slanting his beliefs about submode...

The interest in exploring fame and the love of it relates not only to Hume’s autobiography where he hypothesises the love of literary fame as a key spur to his work, but also to 2.1.11 in the Treatise where Hume offers an account of praise and our delight in it as part of his theory of the passions. It is in this section that Hume first introduces us to the wondrous mechanism of sympathy, a not...

In his sixty-fifth year George Sanders took his own life, leaving a note saying that he was bored. Writing in her sixty-fourth year, Simone de Beauvoir is determined that she, at any rate, will not be bored by old age. This book is a tribute to her energy in researching the sociological, psychological and anthropological aspects of old age?historically and in the present day. Its length (over 5...

In a patient with features indicating the presence of pseudotumor cerebri, a negative cranial CT-scan is not adequate to rule out less benign pathology and an MRI of brain should be performed. In this study, a 10-year old boy with daily headaches for one month and diplopia for one week was found to have a partial abducens palsy and bilateral papilledema; otherwise, his examination was normal. A...

In a patient with features indicating the presence of pseudotumor cerebri, a negative cranial CT-scan is not adequate to rule out less benign pathology and an MRI of brain should be performed. In this study, a 10-year old boy with daily headaches for one month and diplopia for one week was found to have a partial abducens palsy and bilateral papilledema; otherwise, his examination was normal. A...

First of all a few words of introduction . Ulam was a friend and collaborator of mine for about 50 years . We had innumerable mathematical and political discussions and have several joint papers . While discussing mostly our joint work I will neglect his work in physics, biology, computers and computer science . Ulam wrote a very successful autobiography [71 and I will mention only a few incide...