ergodic
意味: Describing a dynamical system or stochastic process in which the long-term time average of a property equals the ensemble average, meaning that a single sufficiently long observation is representative of the whole system.
Ergodic theory is a branch of mathematics with deep applications in statistical mechanics, information theory, and economics. If a process is ergodic, you can infer its overall statistical properties by observing a single trajectory for long enough — you do not need to observe many parallel instances. Many real-world systems are not ergodic, which is why past performance of investments does not necessarily predict future returns. The term is highly specialised and rarely encountered outside academic mathematics, physics, and quantitative finance.
例文
- The ergodic hypothesis in statistical mechanics assumes that a gas molecule will eventually visit every accessible region of phase space given enough time. 统计力学中的遍历假设认为,给定足够的时间,气体分子最终会访问相空间中每一个可达区域。La hipótesis ergódica de la mecánica estadística supone que una molécula de gas acabará visitando todas las regiones accesibles del espacio de fases si se le da el tiempo suficiente.統計力学のエルゴード仮説は、十分な時間が与えられれば、気体分子は位相空間のすべての到達可能な領域を最終的に訪れると仮定する。통계역학의 에르고딕 가설은 충분한 시간이 주어지면 기체 분자가 위상 공간의 모든 접근 가능한 영역을 결국 방문할 것이라고 가정한다.
- Nassim Taleb has argued that many economic models fail because they wrongly assume ergodic conditions where none exist. 纳西姆·塔勒布曾主张,许多经济模型之所以失败,是因为它们错误地假设了并不存在的遍历条件。Nassim Taleb ha argumentado que muchos modelos económicos fracasan porque suponen erróneamente condiciones ergódicas donde no existen.ナシーム・タレブは、多くの経済モデルがエルゴード条件を誤って仮定しているために失敗していると主張している。나심 탈레브는 많은 경제 모델이 에르고딕 조건을 잘못 가정하여 실패하고 있다고 주장해 왔다.
- The researchers proved that the Markov chain was ergodic, guaranteeing convergence to a unique stationary distribution regardless of the initial state. 研究人员证明了该马尔可夫链是遍历的,从而保证无论初始状态如何,都能收敛到唯一的平稳分布。Los investigadores demostraron que la cadena de Márkov era ergódica, garantizando la convergencia a una única distribución estacionaria con independencia del estado inicial.研究者たちはそのマルコフ連鎖がエルゴード的であることを証明し、初期状態に関係なく一意の定常分布への収束が保証されることを示した。연구자들은 해당 마르코프 체인이 에르고딕임을 증명하여, 초기 상태와 무관하게 유일한 정상 분포로의 수렴이 보장됨을 보였다.
発音
使い方ガイド
場面: scientific, academic
トーン: neutral
起源と歴史
From German ergodisch, coined by Ludwig Boltzmann in the 1870s from Greek ergon (work, energy) and hodos (path, way). The term formalised a key assumption in the kinetic theory of gases.
文化的背景
Era: Modern
Generation: All ages
Social background: Universal
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