Hazlehurst's Blog

Finding a way to understand government budgets

As winter deepens, an older man’s fancy turns to — the Poincaré conjecture. Most readers will, I’m sure, be familiar with the classic problem in topology first posed by Henri de Poincaré in 1908. It states: Every simply connected, closed 3-manifold is homeomorphic to the 3-sphere. So absurdly simple! And yet, it baffled mathematicians for [...]

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