formula more short

diff --git a/ising/ising_slides.tex b/ising/ising_slides.tex
index a52fed78fa4cb851375c94eec57b39e2f9ff9faa..3e479034f448fbdc73a90b57eb69fc0b9a66d791 100644 (file)
--- a/ising/ising_slides.tex
+++ b/ising/ising_slides.tex
@@ -305,7 +305,7 @@ F"ur den Fall $B_0 = 0$ gilt:
 \[
  \begin{array}{l}
   \displaystyle \lambda_{\pm} = e^K \pm e^{-K} \\[2mm]
-  \displaystyle Z = 2^N \cosh^N (K) + 2^N \sinh^N (K) = 2^N \cosh^N (K) (1 + \tanh^N (K)) \stackrel{N >> 1}{\longrightarrow} 2^N \cosh^N (K) \\[2mm]
+  \displaystyle Z = 2^N \cosh^N (K) + 2^N \sinh^N (K) \stackrel{N >> 1}{\longrightarrow} 2^N \cosh^N (K) \\[2mm]
   \displaystyle F = -k_B T \, \textrm{ln} \, Z \stackrel{N >> 1}{\longrightarrow} -N k_B T \, \textrm{ln} \, (2 \cosh (\beta J))
  \end{array}
 \]