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\import{macros} | ||
\tag{hopf} | ||
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\texdef{Peano space}{fauser2002treatise}{ | ||
Let $V$ be a linear space of finite dimension $n$. Let lower case $x_i$ denote elements of $V$, which we will call also letters. We define a bracket as an alternating multilinear scalar valued function | ||
$$ | ||
\refdef{Peano space}{fauser2002treatise}{ | ||
\p{ | ||
Let #{V} be a linear space of finite dimension #{n}. Let lower case #{x_i} denote elements of #{V}, which we will call also letters. We define a bracket as an alternating multilinear scalar valued function | ||
##{ | ||
\begin{gathered} | ||
{[, \ldots, .]: V \times \ldots \times V \rightarrow \mathbb{k}} \\ | ||
{\left[x_1, \ldots, x_n\right]=\operatorname{sign}(p)\left[x_{p(1)}, \ldots, x_{p(n)}\right]} \\ | ||
{\left[x_1, \ldots, \alpha x_r+\beta y_r, \ldots, x_n\right]=\alpha\left[x_1, \ldots, x_r, \ldots, x_n\right]+\beta\left[x_1, \ldots, y_r, \ldots, x_n\right]} | ||
\end{gathered} | ||
$$ | ||
$n$-factors | ||
$$ | ||
} | ||
#{n}-factors | ||
##{ | ||
\begin{aligned} | ||
{\left[x_1, \ldots, x_n\right] } & =\operatorname{sign}(p)\left[x_{p(1)}, \ldots, x_{p(n)}\right] \\ | ||
{\left[x_1, \ldots, \alpha x_r+\beta y_r, \ldots, x_n\right] } & =\alpha\left[x_1, \ldots, x_r, \ldots, x_n\right]+\beta\left[x_1, \ldots, y_r, \ldots, x_n\right] | ||
\end{aligned} | ||
$$ | ||
}} | ||
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\p{The sign is due to the permutation #{p} on the arguments of the bracket. The pair #{\mathcal{P}=(V,[., \ldots,])}. is called a Peano space. | ||
}} | ||
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The sign is due to the permutation $p$ on the arguments of the bracket. The pair $\mathcal{P}=(V,[., \ldots,])$. is called a Peano space. | ||
} |
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Original file line number | Diff line number | Diff line change |
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\import{macros} | ||
\tag{hopf} | ||
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\texdef{standard Peano space}{fauser2002treatise}{ | ||
A standard Peano space is a Peano space over the linear space $V$ of dimension $n$ whose bracket has the additional property that for every vector $x \in V$ there exist vectors $x_2, \ldots, x_n$ such that | ||
$$ | ||
\refdef{standard Peano space}{fauser2002treatise}{ | ||
\p{ | ||
A standard Peano space is a Peano space over the linear space #{V} of dimension #{n} whose bracket has the additional property that for every vector #{x \in V} there exist vectors #{x_2, \ldots, x_n} such that | ||
##{ | ||
\left[x, x_2, \ldots, x_n\right] \neq 0 . | ||
$$ | ||
}} | ||
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\p{In such a space the length of the bracket, i.e. the number of entries, equals the dimension of the space, and conversely. We will be concerned here with standard Peano spaces only. | ||
}} | ||
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In such a space the length of the bracket, i.e. the number of entries, equals the dimension of the space, and conversely. We will be concerned here with standard Peano spaces only. | ||
} |