Choongbum Lee works on graph theory and Ramsey theory. His joint paper with David Conlon, Jacob Fox and Benny Sudakov investigates copies of a graph whose vertex order must be preserved.[ref]
Ordered Ramsey numbers by David Conlon and others. Original author byline
The ordered setting is sensitive to labeling: some ordered matchings have superpolynomial Ramsey numbers. Thus low ordinary degree does not by itself make an order-constrained embedding problem easy.[ref]
Ordered Ramsey numbers by David Conlon and others. Abstract and introduction
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