Live Breaking News & Updates on Kay Says

Update (April 5, 2021): So it turns out that Adam Chalcraft and Michael Greene already proved the essential result of this post back in 1994 (hat tip to commenter Dylan). Not terribly surprising in retrospect!
My son Daniel had his fourth birthday a couple weeks ago. For a present, he got an electric train set. (For completeness and since the details of the train set will be rather important to the post it’s called “WESPREX Create a Dinosaur Track”, but this is not an ad and I’m not getting a kickback for it.)
As you can see, the main feature of this set is a Y-shaped junction, which has a flap that can control which direction the train goes. The logic is as follows: ....

David Mackay , Ryan Odonnell , Michael Greene , Erik Demaine , Terence Tao , Adam Chalcraft , Andrew Kay , William Gasarch , Watson Ladd , Sustainable Energy , Embarrassing Myself , Computational Expressiveness , Model Train Set , Ladd Says , O Donnell Says , Kay Says , App Store , Sim Says , Gasarch Says , Mertins Says , Rollercoaster Tycoon , Altman Says , Sensitivity Conjecture , Miller Says , Information Theory , Learning Algorithms ,