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 (franchise) "DOA3" and "DOA4" were released as launch titles for the Xbox and the Xbox 360, respectively. Some of the games, especially "DOA2" and "DOA5", were released in different editions and revisions. "Dead or Alive 5 Last Round" for the consoles is also available in the basic but free-to-play version "Core Fighters", lacking most characters and the story mode, that can be either upgraded to the full version or any additional content can be purchased selectively. A similar model is used in "Dead or Alive Xtreme 3". "Dead or Alive: Code Chronos" was the code name for a cancelled video game