tetrahedron_integrals_test, a FORTRAN90 code which calls tetrahedron_integrals(), which returns the exact value of the integral of any monomial over the interior of the unit tetrahedron in 3D.
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tetrahedron_integrals, a FORTRAN90 code which returns the exact value of the integral of any monomial over the interior of the unit tetrahedron in 3D.