What are e- and m-Riemann-Christoffel curvatures? Currently, I am going through Information Geometry of Boltzmann Machines by Amari et al. In section III, the authors use the terms 'e- and m-Riemann-Christoffel curvatures'. **My question** What are the definitions of e- and m-Riemann-Christoffel curvatures?

I think you will find the answer ( or at least a starting point ) on page 38 of Amaris book.