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# Poincaré sphere

Poincaré sphere may refer to:

Poincaré sphere (optics), a graphical tool for visualizing different types of polarized light

Bloch sphere, a related tool for representing states of a two-level quantum mechanical system

Poincaré homology sphere, in mathematics, an example of a homology sphere

Poincaré disk model A conformal projection of H3 into a sphere

Undergraduate Texts in Mathematics

Graduate Studies in Mathematics

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