What is this? This description was written by a machine and published without a person checking it. It is what the agent made of this grouping, and not a statement anybody has stood behind.

The effectiveness question

A subject the papers are about. The loosest grouping, and the one to reach for last.

Why a formal apparatus invented for its own reasons should turn out to fit the world it is applied to. Collects the papers that take up Wigner's question directly, each answering the last and usually taking its title from it. Membership requires the work to argue about the fit itself, not merely to apply mathematics successfully.