Diffusion determines the compact manifold
                    
                    
                        Banach Center Publications 112 (2017)                    
                                        
                        MSC: 58J53, 35P05, 47F05, 35R30.                    
                                        
                        DOI: 10.4064/bc112-0-1                    
                                    
                                                Abstract
We provide a short proof for the theorem that two compact Riemannian manifolds are isometric if and only there exists an order isomorphism which intertwines between the heat semigroups on the manifolds.
 
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            