Added correct escape character

Author: acotino-ignitioncomputing

tensorly/solvers/admm.py

@@ -96,20 +96,20 @@ def admm(
 
     .. math:: x_{split} = argmin_{x_{split}}~ f(x_{split}) + (\\rho/2)\\|Ax_{split} + Bx - c\\|_2^2
     .. math:: x = argmin_x~ g(x) + (\\rho/2)\\|Ax_{split} + Bx - c\\|_2^2
-    .. math:: dual\_var = dual\_var + (Ax + Bx_{split} - c)
+    .. math:: dual\\_var = dual\\_var + (Ax + Bx_{split} - c)
 
     where rho is a constant defined by the user.
 
     Let us define a least square problem such as :math:`\\|Ux - M\\|^2 + r(x)`.
 
     ADMM can be adapted to this least square problem as following
 
-    .. math:: x_{split} = (UtU + \\rho\\times I)\\times(UtM + \\rho\\times(x + dual\_var)^T)
-    .. math:: x = argmin_{x}~ r(x) + (\\rho/2)\\|x - x_{split}^T + dual\_var\\|_2^2
-    .. math:: dual\_var = dual\_var + x - x_{split}^T
+    .. math:: x_{split} = (UtU + \\rho\\times I)\\times(UtM + \\rho\\times(x + dual\\_var)^T)
+    .. math:: x = argmin_{x}~ r(x) + (\\rho/2)\\|x - x_{split}^T + dual\\_var\\|_2^2
+    .. math:: dual\\_var = dual\\_var + x - x_{split}^T
 
     where r is the regularization operator. Here, x can be updated by using proximity operator
-    of :math:`x_{split}^T - dual\_var`.
+    of :math:`x_{split}^T - dual\\_var`.
 
     References
     ----------