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    <title>Lean - Developers Digest</title>
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    <description>Articles about Lean on Developers Digest</description>
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      <title><![CDATA[Anthropic's Fermat Proof Is an Autoformalization Milestone]]></title>
      <link>https://www.developersdigest.tech/blog/anthropic-fermat-lean-autoformalization-2026</link>
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      <description><![CDATA[Anthropic says Claude worked largely autonomously for 11 days to formalize Fermat's Last Theorem in Lean. The developer lesson is less about one theorem and more about verified repo-scale research artifacts.]]></description>
      <pubDate>Sat, 05 Sep 2026 00:00:00 GMT</pubDate>
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      <category>Anthropic</category>
      <category>AI Research</category>
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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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      <category>OpenAI</category>
      <category>AI Research</category>
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