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# Cauchy-Green tensor

The Cauchy-Green tensor describes the deformation of a material body, playing a key role in nonlinear elasticity and finite deformations.

    template <typename T>
    inline __host__ __device__ void cauchy_green_tensor(T* mat, T* c)

## Parameters

#### `mat`

- Input: 3x3 matrix

#### `c`

- Output: C (symmetric tensor)