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Graph theory is a relatively new branch of mathematics. Early sources of inspiration are Kirchhoff’s theory of electrical networks and the 4-color problem, both from the 19th century. In the 20th century graph theory was one of the most rapidly growing branches of mathematics with applications to theoretical computer science (design and analysis of algorithms), operations research (combinatorial o ...

In computed tomography we mimic the brain’s ability to synthesize an object’s 3D structure from many projections by solving thousands of equations. Many efficient methods have been developed to do that, and the results can be impressive when the object is illuminated from many angles and the noise is negligible. However, one decisive factor behind the human brain's unrivalled success with 3D recon ...