diff --git a/Advanced/Linear Maps/parts/1 spaces.tex b/Advanced/Linear Maps/parts/1 spaces.tex index 6331471..ca632e3 100644 --- a/Advanced/Linear Maps/parts/1 spaces.tex +++ b/Advanced/Linear Maps/parts/1 spaces.tex @@ -16,13 +16,12 @@ A \textit{space} over a field $\mathbb{F}$ consists of the following elements: \textbf{Note:} The same symbols are used for additions and multiplications in both $\mathbb{F}$ and $V$. \\ -Be careful, since \textit{these are different operations!} \\ -Make sure you're aware of the context of each $+$ and $\times$ as you work through this handout. +\textit{These are different operations}, so be aware of the context of each $+$ and $\times$. \vspace{5mm} Vector addition and multiplication must have the following properties. \\ -Note that $x, y, z \in V$ and $a, b\in \mathbb{F}$. +In both tables, $x, y, z \in V$ and $a, b\in \mathbb{F}$. \vspace{2mm} @@ -52,13 +51,19 @@ Note that $x, y, z \in V$ and $a, b\in \mathbb{F}$. Closure & \multicolumn{2}{c}{$ax \in V$} \\ Distributivity & $a(x+y)~$&$~ax+ay$ \\ & $(a+b)x~$&$~ax+bx$ \\ - Compatibility$^*$ & $(ab)x~$&$~x(ba)$ \\ + Compatibility$^*$ & $(ab)x~$&$~a(bx)$ \\ Identity & $a+0~$&$~a$ \end{tabular} \end{center} \end{minipage} -\vspace{5mm} +\vspace{2mm} + +$^*$ Remember that $a, b \in \mathbb{F}$ and $x \in V$. Thus, $(ab)$ is scalar multiplication and $(bx)$ is vector multiplication. \\ +Compatibility is \textit{not} associativity, it is \say{compatibility of vector and scalar multiplication.} + +\vfill +\pagebreak \definition{} There is a good chance you are familiar with basic vector arithmetic. \\