Bugfix: corrected quadrature formula for BEM 3D

Corrected quadrature formula

The case of identical triangles was not implemented correctly.

H2Lib 3.0

The third release of the H2Lib package adds

• DH²-matrices for high-frequency Helmholtz equations,
• acceleration of boundary element methods by OpenCL, AVX and SSE2,
• lowest-order Raviart-Thomas elements for Darcy's equation, and of course
• a number of bugfixes and smaller improvements.

H2Lib 2.0

The second major release of the H2Lib package.

Important new features include the support for complex numbers, finite element discretizations with domain-decomposition clusters, Helmholtz boundary integral equations, accelerated boundary element quadrature using OpenCL, and an alternative implementation of H-matrix arithmetic functions using accumulated low-rank updates.

First step

In this first release of the H2Lib package, we have included basic data structures for cluster, blocks, H- and H²-matrices, and first implementations of algebraic functions for both classes of matrices.
The library also includes functions for setting up boundary element matrices for two- and three-dimensional geometries.