fixed exponent in doc string

Author: dikwickley

pybamm/meshes/one_dimensional_submeshes.py

@@ -112,22 +112,22 @@ class Exponential1DSubMesh(SubMesh1D):
     If side is "left", the gridpoints are given by
 
     .. math::
-        x_{k} = (b-a) + \\frac{\\exp{\\alpha k / N} - 1}{\\exp{\\alpha} - 1} + a,
+        x_{k} = (b-a) + \\frac{e^{\\alpha k / N} - 1}{e^{\\alpha} - 1} + a,
 
     for k = 1, ..., N, where N is the number of nodes.
 
     Is side is "right", the gridpoints are given by
 
     .. math::
-        x_{k} = (b-a) + \\frac{\\exp{-\\alpha k / N} - 1}{\\exp{-\\alpha} - 1} + a,
+        x_{k} = (b-a) + \\frac{e^{-\\alpha k / N} - 1}{e^{-\\alpha} - 1} + a,
 
     for k = 1, ..., N.
 
     If side is "symmetric", the first half of the interval is meshed using the
     gridpoints
 
     .. math::
-        x_{k} = (b/2-a) + \\frac{\\exp{\\alpha k / N} - 1}{\\exp{\\alpha} - 1} + a,
+        x_{k} = (b/2-a) + \\frac{e^{\\alpha k / N} - 1}{e^{\\alpha} - 1} + a,
 
     for k = 1, ..., N. The grid spacing is then reflected to contruct the grid
     on the full interval [a,b].