Fix inverse not written as superscript in math

laurensvalk · laurensvalk · commit a1061ecf2b8d · 2020-08-14T21:34:36.000+02:00
diff --git a/control/statefbk.py b/control/statefbk.py
@@ -263,7 +263,7 @@ def lqe(A, G, C, QN, RN, NN=None):
 
         .. math::
 
-            A P + P A^T - (P C^T + G N) R^-1  (C P + N^T G^T) + G Q G^T = 0
+            A P + P A^T - (P C^T + G N) R^{-1}  (C P + N^T G^T) + G Q G^T = 0
     E: 1D array
         Eigenvalues of estimator poles eig(A - L C)
         
