Update ode_simple_nonlinear_prob.jl

Author: ChrisRackauckas

src/ode/ode_simple_nonlinear_prob.jl

@@ -283,19 +283,19 @@ y₆(0) = -4
 y₇(0) = 4
 ```
 
-and with ``\\frac{dxᵢ(0)}{dt}=\frac{dyᵢ(0)}{dt}=0`` except for
+and with ``\frac{dxᵢ(0)}{dt}=\frac{dyᵢ(0)}{dt}=0`` except for
 
 ```math
-\\frac{dx₆(0)}{dt} = 1.75
+\frac{dx₆(0)}{dt} = 1.75
 ```
 ```math
-\\frac{dx₇(0)}{dt} = -1.5
+\frac{dx₇(0)}{dt} = -1.5
 ```
 ```math
-\\frac{dy₄(0)}{dt} = -1.25
+\frac{dy₄(0)}{dt} = -1.25
 ```
 ```math
-\\frac{dy₅(0)}{dt} = 1
+\frac{dy₅(0)}{dt} = 1
 ```
 
 From Hairer Norsett Wanner Solving Ordinary Differential Equations I - Nonstiff Problems Page 244