%0 Journal Article %A Ingraham, Richard L. %T The geometry of the heat equation %J Compositio Mathematica %D 1954-1956 %P 147-156 %V 12 %I Kraus Reprint %U http://www.numdam.org/item/CM_1954-1956__12__147_0/ %G en %F CM_1954-1956__12__147_0