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:
The 28-year-old previously said he created the event in response to the rising cost of festival and gig tickets.
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美國及英國政府譴責有關懸紅行徑，形容是「跨國鎮壓」。
"This was really an "oh my God" moment," says the scientist behind the findings, Dr Peter Fretwell at British Antarctic Survey, who has worked on Emperor penguins for 20 years.