fix typo

README.md

@@ -5,7 +5,7 @@
 
 [![PyPI version shields.io](https://img.shields.io/pypi/v/matadi.svg)](https://pypi.python.org/pypi/matadi/) [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0) ![Made with love in Graz (Austria)](https://img.shields.io/badge/Made%20with%20%E2%9D%A4%EF%B8%8F%20in-Graz%20(Austria)-0c674a) [![codecov](https://codecov.io/gh/adtzlr/matadi/branch/main/graph/badge.svg?token=2EY2U4ZL35)](https://codecov.io/gh/adtzlr/matadi) [![DOI](https://zenodo.org/badge/408564756.svg)](https://zenodo.org/badge/latestdoi/408564756) ![Codestyle black](https://img.shields.io/badge/code%20style-black-black) ![GitHub Repo stars](https://img.shields.io/github/stars/adtzlr/matadi?logo=github) ![PyPI - Downloads](https://img.shields.io/pypi/dm/matadi)
 
-matADi is a 3.7+ Python package for the definition of a constitutive hyperelastic material formulation by a strain energy density function. Both [gradient](https://en.wikipedia.org/wiki/Gradient) (stress) and [hessian](https://en.wikipedia.org/wiki/Hessian_matrix) (elasticity tensor) are carried out by [**Automatic Differentiation (AD)**](https://en.wikipedia.org/wiki/Automatic_differentiation) using [casADi](https://web.casadi.org/) [[1](https://doi.org/10.1007/s12532-018-0139-4)] as a backend. A high-level interface for hyperelastic materials based on the deformation gradient exists. Several isotropic hyperelastic material formulations like the Neo-Hookean or the Ogden model are included in the model library. Gradient and hessian methods allow input data with trailing axes which is especially useful for Python-based finite element modules, e.g. [scikit-fem](https://scikit-fem.readthedocs.io/en/latest/) or [FElupe](https://github.com/adtzlr/felupe). Mixed-field formulations suitable for nearly-incompressible material behavior are supported as well as single-field formulations based on the deformation gradient. A numerical lab is included to run, plot and analyze homogenous uniaxial, equi-biaxial, planar shear and simple shear load cases.
+matADi is a 3.7+ Python package for the definition of a constitutive hyperelastic material formulation by a strain energy density function. Both [gradient](https://en.wikipedia.org/wiki/Gradient) (stress) and [hessian](https://en.wikipedia.org/wiki/Hessian_matrix) (elasticity tensor) are carried out by [**Automatic Differentiation (AD)**](https://en.wikipedia.org/wiki/Automatic_differentiation) using [casADi](https://web.casadi.org/) [[1](https://doi.org/10.1007/s12532-018-0139-4)] as a backend. A high-level interface for hyperelastic materials based on the deformation gradient exists. Several isotropic hyperelastic material formulations like the Neo-Hookean or the Ogden model are included in the model library. Gradient and hessian methods allow input data with trailing axes which is especially useful for Python-based finite element modules, e.g. [scikit-fem](https://scikit-fem.readthedocs.io/en/latest/) or [FElupe](https://github.com/adtzlr/felupe). Mixed-field formulations suitable for nearly-incompressible material behavior are supported as well as single-field formulations based on the deformation gradient. A numerical lab is included to run, plot and analyze homogeneous uniaxial, equi-biaxial, planar shear and simple shear load cases.
 
 ## Installation
 Install `matADi` from PyPI via pip.
@@ -152,7 +152,7 @@ NH = MaterialHyperelastic(nh, C10=0.5, bulk=200.0)
 ```
 
 ## Lab
-In matADi's `Lab` :lab_coat: numeric experiments on homogenous loadcases on compressible or nearly-incompressible material formulations are performed. For incompressible materials use `LabIncompressible` instead. Let's take the non-affine micro-sphere material model suitable for rubber elasticity with parameters from [[2](https://doi.org/10.1016/j.jmps.2004.03.011), Fig. 19] and run **uniaxial**, **biaxial** and **planar shear** tests.
+In matADi's `Lab` :lab_coat: numeric experiments on homogeneous loadcases on compressible or nearly-incompressible material formulations are performed. For incompressible materials use `LabIncompressible` instead. Let's take the non-affine micro-sphere material model suitable for rubber elasticity with parameters from [[2](https://doi.org/10.1016/j.jmps.2004.03.011), Fig. 19] and run **uniaxial**, **biaxial** and **planar shear** tests.
 
 ```python
 from matadi import Lab, MaterialHyperelastic