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@Yuchenj_UW 2026 is the year of the Singularity
On this day, May 19 1681, Chinese mathematician and writer Mei Juecheng was born.
He published Chishui yizhen (Pearls Recovered from the Red River), which included the infinite series expansion for sin(x), introduced to China via Jesuit missionaries.
sin x = x − x³/3! + x⁵/5! − x⁷/7! + ⋯
(Originally from Gregory & Newton, introduced to China ~1701 as “Du Demei’s formula”)
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Winding for miles, the Qingjiang River glows blue all year round. No need for distant mountains or seas—romance lives right here in Yichang.
@GorgeousYichang
