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Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.
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1982_02_04_tashkinov: Tashkinov proves that every 4-regular graph has a 3-regular subgraph, the Berge--Sauer conjecture, and that every r-regular graph with r at least 3 has one, which answers both questions of Problem 715 affirmatively.
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