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.
A concerted buildout of nuclear power left France with one of the least carbon-intensive economies in the world. And then, of course, there was the Minitel. More than a decade before anyone was typing “www” into their web browsers, French users were able to buy train tickets, check film showings, do their banking, play games, find recipes, read their horoscopes, or even log into, yes, erotic chats – la messagerie rose, as it was known.
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