2014/01/06 by Ortaçgil, Ercüment
#22E05 #58H05 #58Hxx #Algebraic Geometry (math.AG) #FOS: Mathematics
paper · doi:10.48550/arxiv.1401.1116
This note is an extended version of my presentation at the "Focused Research Workshop on Exterior Di§erential Systems and Lie Theory" held at the Fields Institute in Toronto, December 9-13, 2013. Some ideas and constructions of this note crystallized during my communication with Anthony D. Blaom. I am deeply grateful to him and also to P.J. Olver for his constant help and encouragement.