Ries is located in Austria (Graz Stadt, Styria) and time zone Europe/Vienna.
Places nearby are Mariatrost, Waltendorf and Sankt Leonhard.
Favoriten is 139 km away, Vienna is 143 km away and Floridsdorf is 148 km away as the crow flies.
Distances from Ries to the most important cities in Austria and the world.
47.0831500°
15.4850000°
Theorem about the dual of a Hilbert space
https://en.wikipedia.org/wiki/Riesz_representation_theoremTheorem on operator interpolation
https://en.wikipedia.org/wiki/Riesz–Thorin_theorem