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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:，更多细节参见51吃瓜
The union argues that, despite the pay rises, resident doctors' pay is still a fifth lower than it was in 2008, once inflation is taken into account.
In addition to keeping five beehives, Dr Juraj Majtán heads a lab studying bees and bee products at the Institute of Molecular Biology, part of the Slovak Academy of Sciences.