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Pure 2 Chapter 6 Trigonometric Identities and Equations A-level Mathematics International

Understanding Pure Mathematics for Cambridge University

Poincaré’s Conjecture is one of the most profound and famous problems in topology, the branch of mathematics concerned with the properties of space that are preserved under continuous deformation. Proposed by Henri Poincaré in 1904, the conjecture asks: If a shape in 3D space is so smooth and simple that every loop on it can be shrunk to a point, is it just a 3-sphere? In simpler terms, it’s a deep question about the fundamental structure of three-dimensional spaces. For nearly a century, the Po