$$\left.\begin{array}{r} x\in X \\ (X,\wedge,\vee,\perp,0,1) \text{ Boole cebiri} \end{array}\right\}\Rightarrow x\wedge x=x\Rightarrow x\leq x.$$
- $x\leq y$ ve $y\leq x$ olsun.
$$\left.\begin{array}{rr} x\leq y\Rightarrow x\wedge y=x \\ y\leq x \Rightarrow y\wedge x=y \\ (X,\wedge,\vee,\perp,0,1) \text{ Boole cebiri} \end{array}\right\}\Rightarrow x=y.$$
- $x\leq y$ ve $y\leq z$ olsun.
$$\left.\begin{array}{rr} x\leq y\Rightarrow x\wedge y=x \\ y\leq z \Rightarrow y\wedge z=y \\ (X,\wedge,\vee,\perp,0,1) \text{ Boole cebiri} \end{array}\right\}\Rightarrow x\wedge z=x\Rightarrow x\leq z.$$
Not: Boole cebiri tanımı bu linkte mevcut.