Isoperimetric-type bounds for solutions of the heat equation Rodrigo BanuelosPawel Kroger Indiana University Mathematics Journal 1997 text pdf 10.1512/iumj.1997.46.1350 10.1512/iumj.1997.46.1350 en Indiana Univ. Math. J. 46 (1997) 83 - 92 state-of-the-art mathematics http://iumj.org/access/