The city of Kristiania was renamed Oslo in 1925 by which time Ore had returned there as an assistant, but before this he had studied in a number of universities while undertaking research.
Ang lungsod ng Kristiania ay muli Oslo sa 1925 na kung saan ang oras ng mineral ay returned doon bilang isang assistant, ngunit bago ito niya-aral sa isang bilang ng mga unibersidad habang pagsasagawa ng pananaliksik.