There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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居住在上海的德商麥永剛（Juergen Meyer），2013年以德國財務與風險管理經理的身份來到中國，之後長居上海，在金融及IT領域工作，專注於企業整體獲利與風險管理。最近他與上海夥伴合著《與中國做生意的企業風險管理》一書，詳細剖析在中國經商的逾50種風險。