[**microresearch**]

We calculate the Lyapunov exponents of the complex stretch factor $f^-(z)=(1-z^2)^{-1/2}$ from the Lorentz transformations and of its reciprocal $f^+(z)=(1-z^2)^{+1/2}$ as well.

https://doi.org/10.31219/osf.io/jsncm

**Open Mathematics Collaboration**

Op. J. Math. Phys.

Volume 3, Article 239, 2021 [JJ]