Source: cirosantilli/solution-of-the-ising-model
= Solution of the Ising model
TODO what it means to solve an Ising model in general?
https://stanford.edu/~jeffjar/statmech/lec4.html gives some good notions:
* $<\sigma_i>$ is the <expectation value> of the value. It is therefore a number between -1.0 an and 1.0, -1.0 means everything is always down, 0.0 means half up half down, and 1.0 means all up
* $<\sigma_i \sigma_j>$: correlation between neighboring states. TODO.