High Quality Content by WIKIPEDIA articles The Ising model (English pronunciation: /ˈaɪsɪŋ/, German: ) is a mathematical model of ferromagnetism in statistical mechanics. The model consists of discrete variables called spins that can be in one of two states (+1 or -1). The spins are arranged in a graph (usually, a lattice), and each spin interacts with its nearest neighbors. The goal is to find phase transitions in the Ising model, as a simplified model of phase transitions in real substances. The two-dimensional square lattice Ising model is one of the simplest statistical models to show a phase transition.
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