The Monthly publishes articles, as well as notes and other features, about mathematics and the profession. Its readers span a broad spectrum of mathematical interests, and include professional ...

This is a preview. Log in through your library . Abstract For the ring of integers 𝓞 of a totally real algebraic field, Julia Robinson defines a set A(𝓞) such that either A(𝓞) = {+∞} or it is an ...