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Number theorists
1261 deaths
13th-century Chinese mathematicians
Chinese inventors
1200s births
Song dynasty government officials
Politicians from Ziyang
13th-century Chinese writers
Chinese meteorologists
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Song dynasty science writers
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Qin Jiushao: page information

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Page ID612837

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OriginImported

CreatedJun 19, 2026, 2:16 AM

UpdatedJun 19, 2026, 2:16 AM