New research suggests that humans used complex geometry more than a thousand years earlier than previously thought.
新研究表明人类很早就会使用复杂几何，其时间比之前料想的要早一年多年。
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Complex geometry
In mathematics, complex geometry is the study of complex manifolds and functions of many complex variables. Application of transcendental methods to algebraic geometry falls in this category, together with more geometric aspects of complex analysis.
Throughout this article, "analytic" is often dropped for simplicity; for instance, subvarieties or hypersurfaces refer to analytic ones. Following the convention in Wikipedia, varieties are assumed to be irreducible.