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...' of <math>X \times Y \times Z,\!</math> and notated here as <math>\mathrm{Pow} (X \times Y \times Z).\!</math> ...mathcal{L}_{XYZ} ~=~ \{ L : L \subseteq X \times Y \times Z \} ~=~ \mathrm{Pow} (X \times Y \times Z).\!</math>

...measure of constraint, in other words, the information, that comes between Pow(X), the full lattice of all possible subsets of the universe X, and Nat(X), ...only some mysterious 'je ne sais quoi' subset of "natural kinds", Nat(X) c Pow(X), is at stake, a limitation that, whatever else it does, excludes the set

...L : X_1 \times \ldots \times \hat{j} \times \ldots \times X_k \to \mathrm{Pow}(X_j) {}^{\prime\prime}</math> indicate this use of <math>{}^{\backprime\ba ...>X \times Z \to \mathrm{Pow}(Y),\!</math> and <math>Y \times Z \to \mathrm{Pow}(X).\!</math>

...p>, or what is the same thing, ''f''^&ndash;1 : '''B''' &rarr; ''Pow''('''B'''^''n''), and the ''fibers'' or inverse images ''f''<sup> ...'power set'' of ''X'' and often denoted as <font face="lucida calligraphy">Pow</font>(''X'') or 2^''X''.

f^(-1) c B x B^n, or what is the same thing, f^(-1) : B -> Pow(B^n), and and often denoted as Pow(X) or 2^X.