Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.
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Source: original paper, printed pp. 529–530.
Write when every red-blue coloring of the whole space has a red congruent copy of or a blue congruent copy of . A congruent copy is an image under a Euclidean isometry. A translate is more restrictive: it preserves the given orientation. No measurability or other regularity of a coloring is assumed.
Let , where . It contains points and unit gaps. A -dimensional brick with positive side lengths means its vertices, isometric to .
The source calls a finite configuration Ramsey when for every finite color count it is forced in some sufficiently high dimension. This is a statement about dimension as well as color count. A planar conclusion, a higher-dimensional conclusion and a translation-only conclusion must not be interchanged.
The paper's open questions describe its historical state. In particular its comments about five blue collinear points or a blue unit square in the plane do not establish the current status of Problem 188 or Problem 214.