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    Finite Volume Solver
    prototype
    
   A framework to build finite volume solvers for the AG Klein at the Freie Universität Berlin. 
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This is true std::true_type iff E is extents<Es...> for some std::ptrdiff_t...  
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#include <mdspan.hpp>
This is true std::true_type iff E is extents<Es...> for some std::ptrdiff_t... 
Es.