Douglas MacArthur | Douglas | Douglas DC-3 | Douglas Adams | Jesse Ventura | Michael Douglas | Jesse Owens | Jesse Jackson | Jesse James | Douglas Fairbanks | Douglas Bader | McDonnell Douglas | Kirk Douglas | William O. Douglas | Alec Douglas-Home | Douglas C-47 Skytrain | Lord Alfred Douglas | Jesse McCartney | Douglas Mawson | Douglas Aircraft Company | Douglas Niles | Douglas, Isle of Man | Douglas Haig, 1st Earl Haig | Douglas Fairbanks, Jr. | Douglas DC-6 | Douglas Hofstadter | Paul Douglas | Douglas Hurd | Douglas County | Mike Douglas |
A notable advance in this field was a 1941 paper by the American mathematician Jesse Douglas, in which he provided necessary and sufficient conditions for the problem to have a solution; these conditions are now known as the Helmholtz conditions, after the German physicist Hermann von Helmholtz.