This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
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Ирак тем временем уже начал сокращать добычу, а Саудовская Аравия ищет альтернативные пути экспорта углеводородов. Фьючерс на нефть марки Brent вернулся в среду, 4 марта, к росту, прибавляя к моменту написания материала 3,11 процента, до 83,93 доллара за баррель.
But, range queries are not supported by the GIN index; asking for all products with the SIZE variations having value in a certain number range will not utilize the index. In cases like this, it is necessary to move some fields out of JSON documents to separate columns/tables and index them traditionally, using old and proven B-trees. In these instances, Mongo is more forgiving and flexible. It allows for strategies of the kind: