# Harald Bohr

> Danish mathematician and footballer (1887–1951)

**Wikidata**: [Q310009](https://www.wikidata.org/wiki/Q310009)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Harald_Bohr)  
**Source**: https://4ort.xyz/entity/harald-bohr

## Summary
Harald Bohr was a Danish mathematician and footballer (1887–1951) who made significant contributions to mathematical analysis and was affiliated with prestigious Danish universities. His work in mathematics, particularly in complex analysis, left a lasting impact on the field.

## Biography
- Born: April 22, 1887, in Copenhagen, Denmark
- Nationality: Danish
- Education: Studied at the University of Copenhagen and the Technical University of Denmark
- Known for: Contributions to mathematical analysis, including the Bohr–Mollerup theorem
- Employer(s): University of Copenhagen, Technical University of Denmark
- Field(s): Mathematics, Mathematical analysis

## Contributions
Harald Bohr is known for his work in mathematical analysis, particularly the **Bohr–Mollerup theorem**, which provides a characterization of the gamma function. His research in complex analysis and almost periodic functions advanced the field. He also made notable contributions to the study of almost periodic functions, which are functions that "converge" to periodicity. His work was influential in shaping modern mathematical analysis.

## FAQs
**Where did Harald Bohr study?**
Harald Bohr studied at the **University of Copenhagen** and the **Technical University of Denmark**, where he contributed to mathematical research.

**What is the Bohr–Mollerup theorem?**
The **Bohr–Mollerup theorem** is a fundamental result in complex analysis that characterizes the gamma function. It was developed by Harald Bohr and others, providing a rigorous foundation for the properties of the gamma function.

**What is an almost periodic function?**
An **almost periodic function** is a function that "converges" to periodicity, meaning it behaves in a way that approximates periodic behavior. Harald Bohr made significant contributions to the study of these functions in mathematical analysis.

**What universities was Harald Bohr affiliated with?**
Harald Bohr was affiliated with the **University of Copenhagen** and the **Technical University of Denmark**, where he conducted research and taught mathematics.

## Why They Matter
Harald Bohr's work in mathematical analysis, particularly the **Bohr–Mollerup theorem**, laid the groundwork for understanding the gamma function and complex analysis. His contributions to the study of almost periodic functions expanded the field's theoretical foundations. By formalizing key concepts, his research influenced later mathematicians and remains relevant in modern mathematical theory. His legacy endures in the rigorous methods he established, which are still applied in advanced mathematical research.

## Notable For
- **Bohr–Mollerup theorem**: A landmark result in complex analysis that characterized the gamma function.
- **Almost periodic functions**: Pioneered the study of functions that approximate periodicity, advancing mathematical analysis.
- **University of Copenhagen and Technical University of Denmark**: Affiliated with these institutions, where he conducted influential research.
- **Danish mathematician**: A key figure in Danish mathematical circles, contributing to the field's global reputation.

## Body
### Early Life and Education
Harald Bohr was born on **April 22, 1887**, in **Copenhagen, Denmark**. He pursued his education at the **University of Copenhagen** and the **Technical University of Denmark**, where he developed a strong foundation in mathematics.

### Mathematical Contributions
Harald Bohr made significant contributions to **mathematical analysis**, particularly in the study of **almost periodic functions**. His work on these functions, which "converge" to periodicity, expanded the field's theoretical framework. He also developed the **Bohr–Mollerup theorem**, a fundamental result in complex analysis that characterized the gamma function. This theorem provided a rigorous foundation for understanding the properties of the gamma function, influencing later mathematical research.

### Academic Affiliations
Harald Bohr was affiliated with the **University of Copenhagen** and the **Technical University of Denmark**, where he conducted influential research and taught mathematics. His work at these institutions contributed to the development of mathematical analysis and complex analysis.

### Legacy and Influence
Harald Bohr's contributions to mathematical analysis, particularly the **Bohr–Mollerup theorem** and the study of almost periodic functions, left a lasting impact on the field. His rigorous methods and theoretical advancements shaped modern mathematical theory and influenced later mathematicians. His legacy endures in the rigorous foundations he established, which remain relevant in advanced mathematical research.

## References

1. Great Soviet Encyclopedia (1969–1978)
2. Olympedia
3. BnF authorities
4. Integrated Authority File
5. LIBRIS. 2012
6. MacTutor History of Mathematics archive
7. Czech National Authority Database
8. Find a Grave
9. Mathematics Genealogy Project
10. International Standard Name Identifier
11. Virtual International Authority File
12. CiNii Research
13. SNAC
14. Brockhaus Enzyklopädie
15. Dansk Biografisk Leksikon
16. Roglo
17. Freebase Data Dumps. 2013