Question: Were Harald Kidde and Ernst G. Straus of the same nationality?
Sentence (from "Ernst G. Straus"): His extensive list of co-authors includes Albert Einstein, Paul Erdős, Richard Bellman, Béla Bollobás, Sarvadaman Chowla, Ronald Graham, Mathukumalli V Subbarao, László Lovász, Carl Pomerance, and George Szekeres.
Relevant evidence: No