Erdős problem 1199Is it true that in any 2-colouring of N\mathbb{N} there exists an infinite set AA such that all elements of A+AA+A are the same colour?WorkspaceContinue locallyOpen sourceSign in to contributeOpen this exact Problem, source revision, and authority Repository in Workbench. This handoff does not clone, switch, upload, or execute anything.FilesErdős problem 11993 retained source recordsCanvaspublic previewSource#1199→ResultNone→Checks0