Erdős problem 195What is the largest kk such that in any permutation of Z\mathbb{Z} there must exist a monotone kk-term arithmetic progression x1<⋯<xkx_1 < \cdots < x_k?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 1954 retained source recordsCanvaspublic previewSource#195→ResultNone→Checks0