

![0_image_0.png](0_image_0.png)

}  }  }   j  $\large\color{blue}{\begin{array}{c}\text{j}\\ \text{stack}\end{array}}$  . 
$$\mathbf{unstack}$$
$$\mathbf{s}\tan\mathbf{c}\mathbf{k}$$
$$6.2.1\;\;\;\mathrm{COMPLETNESS}$$
$$m\,u\,s\,t$$
$$\{A\,,B\}$$
$\begin{array}{ccccc}&\dagger&\dagger&\dagger\\ \mbox{\bf op}A&&\emptyset,&\{A\},&\emptyset\\ \mbox{\bf op}B&&\{A\},&\{B\},&\{A\}\\ \mbox{\bf op}A&&\mbox{\bf op}B&&\mbox{\bf op}B\end{array}$
$$A\ m\,u\,s\,t$$
FALSE

$$\begin{array}{c c c}{{}}&{{}}&{{}}\\ {{}}&{{}}&{{}}\\ {{\mathbf{op}\,B}}&{{}}&{{}}\end{array}$$
$$ B$$. 
 $\phantom{\rule{0.2em}{0ex}}6.2.2\phantom{\rule{0.2em}{0ex}}\text{INTEGRATION}\phantom{\rule{0.2em}{0ex}}\text{INTO}\phantom{\rule{0.2em}{0ex}}\text{SEARCH}$ ? 