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--- on_model [2021/04/13 01:21]
Scott Lawrence
+++ on_model [2021/05/07 19:49] (current)
Scott Lawrence
@@ Line 3: / Line 3: @@
 {{tag>3d holographic}}
-The special cases of the [[o2_model]] and [[o3_model]] are particularly well-studied. The [[Ising|Ising model]] is the case $N=1$, and the case $N=0$ is covered by  [[self_avoiding_walk|self-avoiding walks]].
+The special cases of the [[o2_model]] and [[o3_model]] are particularly well-studied. Higher values of $N$ do come up occasionally, see for instance the [[o4_model]]. The [[Ising|Ising model]] is the case $N=1$, and the case $N=0$ is covered by  [[self_avoiding_walk|self-avoiding walks]].
-This also goes by the name of the "n-vector model".
+This also goes by the name of the "n-vector model", or "non-linear $\sigma$ model$.
 ===== Large-N limit =====

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