Conformal Deformation and the Heat Operator Thomas BransonBent Orsted Indiana University Mathematics Journal 1988 text pdf 10.1512/iumj.1988.37.37004 10.1512/iumj.1988.37.37004 en Indiana Univ. Math. J. 37 (1988) 83 - 110 state-of-the-art mathematics http://iumj.org/access/