.. role:: option(literal)
.. role:: file(literal)
.. _TUTORIAL8:

Nonlinear Elasticity and Mixed Language Programming (*)
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**Objective:** At the end of this tutorial you will see how functionality can be written in Fortran and then called from the C-based PetIGA library. 

**Assumptions:** 


Writing Tensor Operations in Fortran
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Calling Fortran from C
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Dissecting :file:`HyperElasticity.c`
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Writing Residuals and Jacobians in Fortran
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