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:: <math>X = \langle \mathcal{X} \rangle = \langle x, y \rangle = \{ (x, y) \} \cong \mathbb{B}^2.</math>
 
:: <math>X = \langle \mathcal{X} \rangle = \langle x, y \rangle = \{ (x, y) \} \cong \mathbb{B}^2.</math>
   −
: Each point in <math>X\!</math> may be described by means of a ''singular proposition'', that is, a proposition that describes it uniquely.  This form of representation leads to the follwing enumeration of points:
+
: Each point in <math>X\!</math> may be described by means of a ''singular proposition'', that is, a proposition that describes it uniquely.  This form of representation leads to the following enumeration of points:
    
:: <math>X = \{ (x)(y), (x) y, x (y), x y \} \cong \mathbb{B}^2.</math>
 
:: <math>X = \{ (x)(y), (x) y, x (y), x y \} \cong \mathbb{B}^2.</math>
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