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- Mängdoperation:
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- Differens: $A\setminus\text{B} = \{x\in\mathcal{U}:x\in\text{A}\land\text{x}\not\in\text{B}\}$
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- Symetrisk Differens $A\triangle\text{B}=\{x\in\mathcal{U}:x\in\text{A}\cup\text{B}\land\text{x}\not\in\text{A}\cap\text{B}\}$
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- Symetrisk Differens $A\triangle\text{B}=\{x\in\mathcal{U}:x\in\text{A}\cup\text{B}\land\text{x}\not\in\text{A}\cap\text{B}\}$ = $(A\cup{B})\setminus(A\cap{B})$
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- Räkne regler:
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- Dublekomplement: $\overline{\overline{A}} = A$
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- Idempotens: $A\cup\text{A}=A$, $A\cap\text{A}=A$
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