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@ -16,13 +16,12 @@ A \textit{space} over a field $\mathbb{F}$ consists of the following elements:
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\textbf{Note:}
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The same symbols are used for additions and multiplications in both $\mathbb{F}$ and $V$. \\
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Be careful, since \textit{these are different operations!} \\
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Make sure you're aware of the context of each $+$ and $\times$ as you work through this handout.
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\textit{These are different operations}, so be aware of the context of each $+$ and $\times$.
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\vspace{5mm}
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Vector addition and multiplication must have the following properties. \\
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Note that $x, y, z \in V$ and $a, b\in \mathbb{F}$.
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In both tables, $x, y, z \in V$ and $a, b\in \mathbb{F}$.
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\vspace{2mm}
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@ -52,13 +51,19 @@ Note that $x, y, z \in V$ and $a, b\in \mathbb{F}$.
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Closure & \multicolumn{2}{c}{$ax \in V$} \\
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Distributivity & $a(x+y)~$&$~ax+ay$ \\
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& $(a+b)x~$&$~ax+bx$ \\
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Compatibility$^*$ & $(ab)x~$&$~x(ba)$ \\
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Compatibility$^*$ & $(ab)x~$&$~a(bx)$ \\
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Identity & $a+0~$&$~a$
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\end{tabular}
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\end{center}
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\end{minipage}
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\vspace{5mm}
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\vspace{2mm}
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$^*$ Remember that $a, b \in \mathbb{F}$ and $x \in V$. Thus, $(ab)$ is scalar multiplication and $(bx)$ is vector multiplication. \\
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Compatibility is \textit{not} associativity, it is \say{compatibility of vector and scalar multiplication.}
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\vfill
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\pagebreak
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\definition{}
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There is a good chance you are familiar with basic vector arithmetic. \\
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