Wigner's friend and continuous time evolution of the state of a closed system and the probabilistic, discontinuous collapse of the state of a system upon measurement. Wigner's friend is therefore directly linked to the measurement problem in quantum mechanics with its famous Schrödinger's cat paradox. The thought experiment posits a friend of Wigner in a laboratory and lets him perform a quantum measurement on a physical system (this could be a spin system or also Schrödinger's cat). This system is assumed to be in a superposition of two distinct states, say, state 0 and state 1 (or "dead" and "alive", in the
Dead or Alive 5 Ultimate awarded the both versions of game four out of five stars, wrote that it is "a satisfying update to the "DoA" experience, for just $40," but cautioned that "casual fans content with last year's copy of "Dead or Alive 5" might not want to buy another game so soon." Angelo M. D’Argenio of Cheat Code Central opined that "Ultimate" is a must-have purchase only for those who are still playing "Dead or Alive 5", giving the PS3 version a relatively low score of 3.2/5. According to "Hardcore Gamer"'s Adam Beck, however, "there’s something here for everyone;" he rated the PS3