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    <title>Developers Digest - Lean</title>
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      <title><![CDATA[OpenAI Publishes Ten Decade-Open Math Proofs, Each Formalized in Lean]]></title>
      <link>https://www.developersdigest.tech/blog/openai-ten-advances-mathematics-lean-2026</link>
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      <description><![CDATA[OpenAI's next model, codenamed Astra, produced results on ten problems open for at least a decade - including non-sofic groups and Erdős problems 146, 180, and 183 - with every argument formalized as a Lean certificate.]]></description>
      <pubDate>Sat, 01 Aug 2026 00:00:00 GMT</pubDate>
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