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Square lattice Ising model
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<p>In <a href="/facts/Statistical_mechanics/6zMsNYYG">statistical mechanics</a>, the two-dimensional square lattice Ising model is a simple <a href="/facts/Lattice_model_(physics)/TY3bVAhk">lattice model</a> of interacting <a href="/facts/Magnetic_spin/fAWlKXh8">magnetic spins</a>, an example of the class of <a href="/facts/Ising_model/lvBpj2h1">Ising models</a>. The model is notable for having nontrivial interactions, yet having an <a href="/facts/Analytical_solution/y0xCXlSk">analytical solution</a>. The model was solved by <a href="/facts/Lars_Onsager/V1rDtqkQ">Lars Onsager</a> for the special case that the external magnetic field <i>H</i> = 0. An analytical solution for the general case for H ≠ 0 {\displaystyle H\neq 0} has yet to be found. </p>