Jones and Thron attribute the following result to Van Vleck.
Year 2000 problem | Waring's problem | The Final Problem | The Problem with Popplers | Intertropical Convergence Zone | Hume and the Problem of Causation | Dirichlet problem | Convergence and Union | Boolean satisfiability problem | The Dog Problem | Tammes problem | Species problem | problem solving | Problem gambling | Packing problem | packing problem | Mobile-to-mobile convergence | Doob's martingale convergence theorems | Doob's martingale convergence theorem | chess problem | Znám's problem | Year 10,000 problem | Yamabe problem | Weber problem | Undecidable problem | Travelling salesman problem | travelling salesman problem | The Problem of Thor Bridge | The Problem of the Media: U.S. Communication Politics in the 21st Century | The Problem of Social Cost |