About the detention of mathematics in the century before last
One of the founders of the geometry of spheres, the Norwegian, Sofus Lee , like me, was delayed by the police . True, under other circumstances. In the 19th century, he with two colleagues, I remember only one, Klein, made a trip to Paris to get acquainted with the theory of groups there. Big the consequences of this trip for science were huge even. And on the way back, he decided to take a walk. On foot in Europe. The Franco-Prussian War began, without noticing it, he came to Germany, Prussia.