Harald Bohr (22 April 1887 - 22 January 1951) was a Danish mathematician, and younger brother of the physicist Niels Bohr. Many friends remarked that the two men were unusually close, even for brothers. Early in the lives of the brothers, Harald was thought to be more likely to be successful.
Harald Bohr worked in mathematical analysis, founding the field of almost periodic functions, and worked with the Cambridge mathematician G. H. Hardy. Bohr was also an excellent soccer player; he won a silver medal at the 1908 Summer Olympics with the Danish national football team.
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MacTutor biography