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==Mathcal==
 
==Mathcal==
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<math>\mathcal{X}</math>
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<math>X \quad = \quad \langle \mathcal{X} \rangle \quad = \quad \langle u, v \rangle \quad = \quad \{ (u, v) \} \quad \cong \quad \mathbb{B}^2</math>
 
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<math>[\mathcal{X}]</math>
 
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