2009 Formula One World Championship kept on the calendar, with the organisers of both events pulling out due to financial issues. The Abu Dhabi Grand Prix made its début appearance as the last round of the season, at the Hermann Tilke-designed Yas Marina Circuit. The race, starting at sunset, was Formula One's first day-night race. The first multi-team testing session took place at Circuit de Catalunya, Barcelona in November 2008, two weeks after the end of previous season. All teams, except Toyota, took part in the testing session where some teams tested their new aerodynamics package and slick tyres. The new look cars did not
Boolean circuit "m" nodes which are labeled as the outputs. The edges must also have some ordering, to distinguish between different arguments to the same Boolean function. As a special case, a propositional formula or Boolean expression is a Boolean circuit with a single output node in which every other node has fan-out of 1. Thus, a Boolean circuit can be regarded as a generalization that allows shared subformulas and multiple outputs. A common basis for Boolean circuits is the set {AND, OR, NOT}, from which all other Boolean functions can be constructed. The Circuit Value Problem, the problem of computing the