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''X''<sup>&bull;</sup><br>
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<math>\begin{matrix}
[<font face="lucida calligraphy">X</font>]<br>
+
X^\circ
[''x''<sub>1</sub>, &hellip;, ''x''<sub>''n''</sub>]<br>
+
& = & [\mathcal{X}]           \\
(''X'', ''X''^)<br>
+
& = & [x_1, \ldots, x_n]     \\
(''X'' +&rarr; '''K''')<br>
+
& = & (X, X^\uparrow)         \\
(''X'', (''X'' &rarr; '''K'''))<br>
+
& = & (X\ +\!\to \mathbb{K}) \\
isomorphic to:<br>
+
& = & (X, (X \to \mathbb{K})) \\
('''K'''<sup>''n''</sup>, ('''K'''<sup>''n''</sup> &rarr; '''K'''))<br>
+
& \cong & (\mathbb{K}^n, (\mathbb{K}^n \to \mathbb{K})) \\
('''K'''<sup>''n''</sup> +&rarr; '''K''')<br>
+
& \cong & (\mathbb{K}^n\ +\!\to \mathbb{K})             \\
['''K'''<sup>''n''</sup>]
+
& \cong & [\mathbb{K}^n]                                \\
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\end{matrix}</math>
 
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<u>''X''</u><sup>&bull;</sup><br>
 
<u>''X''</u><sup>&bull;</sup><br>
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