swjeong

I found that `simplify` does not work for the parts that are not the first or the last part of homogeneous factors. Here's an example: ``` julia> using Symbolics julia>...

 Solving the above implicit 2nd-order ODE, trying to go backwards ``` using SpecialFunctions, DifferentialEquations n = 8 function PainleveIV!(out, du, u, p, t) # u = [σ, σₓ] out[1]...

add matrix exponentials

7

Quaternion matrix exponential added using a quick detour to complex representation.