Homology Classes of Semi-Algebraic Sets and Mass Minimization Quentin Funk Indiana University Mathematics Journal 2016 text pdf 10.1512/iumj.2016.65.5771 10.1512/iumj.2016.65.5771 en Indiana Univ. Math. J. 65 (2016) 641 - 663 state-of-the-art mathematics http://iumj.org/access/