# Thābit ibn Qurra

> Mesopotamian astronomer and mathematician

**Wikidata**: [Q250568](https://www.wikidata.org/wiki/Q250568)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Thābit_ibn_Qurra)  
**Source**: https://4ort.xyz/entity/thabit-ibn-qurra

## Summary
Thābit ibn Qurra was a Mesopotamian astronomer, mathematician, physician, and astrologer who lived during the Abbasid Caliphate. He is best known for his extensive work in number theory, particularly his discoveries regarding amicable numbers and the integers now known as Thabit numbers. His contributions to mathematics, astronomy, and mechanics were developed while he was affiliated with the House of Wisdom in Baghdad.

## Biography
- **Born**: Data not available in source material
- **Nationality**: Mesopotamian (associated with the Abbasid Caliphate)
- **Education**: Data not available in source material
- **Known for**: Contributions to number theory (amicable numbers, Thabit numbers), astronomy, mechanics, and medicine
- **Employer(s)**: House of Wisdom (library, translation institute, and research center in medieval Baghdad)
- **Field(s)**: Mathematics, Astronomy, Medicine, Astrology, Mechanics

## Contributions
Thābit ibn Qurra's work resulted in several specific mathematical concepts and scientific advancements:
- **Amicable Numbers**: He made significant discoveries in number theory regarding pairs of integers related by their divisors.
- **Thabit Numbers**: He is associated with the integer form $3 \cdot 2^n - 1$ for non-negative $n$, a concept now named after him.
- **Translation and Research**: Through his affiliation with the House of Wisdom, he contributed to the library, translation institute, and research center activities in medieval Baghdad.
- **Mechanics and Astronomy**: He applied his knowledge to the science of physical bodies subjected to forces (mechanics) and the study of celestial objects (astronomy).
- **Medical Practice**: He practiced as a physician, applying his professional skills to medicine.
- **Astrological Practice**: He engaged in the practice of astrology alongside his scientific pursuits.

## FAQs
**What were Thābit ibn Qurra's primary professional roles?**
He was a multifaceted scholar who worked as a mathematician, astronomer, physician, and astrologer. His career spanned the study of celestial bodies, the practice of medicine, and the exploration of pure mathematics.

**Which institution was Thābit ibn Qurra affiliated with?**
He was affiliated with the House of Wisdom, a renowned library, translation institute, and research center located in medieval Baghdad. This organization served as a central hub for his intellectual and scientific activities during the Abbasid Caliphate.

**What specific mathematical concepts are named after or associated with him?**
He is linked to "Thabit numbers," which are integers of the form $3 \cdot 2^n - 1$, and he made notable contributions to the study of "amicable numbers," which are pairs of integers related by their divisors.

**Did Thābit ibn Qurra contribute to fields outside of mathematics?**
Yes, his expertise extended to astronomy, where he studied celestial objects and phenomena, and mechanics, the science concerned with physical bodies under forces. He also practiced medicine and astrology.

## Why They Matter
Thābit ibn Qurra's work fundamentally expanded the boundaries of number theory and the application of mathematics to physical sciences. By defining specific integer forms like Thabit numbers and advancing the understanding of amicable numbers, he provided tools that remain relevant in mathematical study today. His presence at the House of Wisdom helped solidify Baghdad as a center of learning, ensuring the preservation and translation of knowledge during the Abbasid Caliphate. Without his contributions to mechanics and astronomy, the historical development of these sciences in the Islamic Golden Age would lack a key figure who bridged theoretical mathematics with physical observation.

## Notable For
- Being a Mesopotamian scholar active during the Abbasid Caliphate (750–1258).
- Defining the integer form $3 \cdot 2^n - 1$, now known as a Thabit number.
- Advancing the study of amicable numbers through the analysis of integer divisors.
- Serving as a physician, astronomer, mathematician, and astrologer simultaneously.
- Working at the House of Wisdom, a premier research and translation center in Baghdad.
- Contributing to the fields of mechanics, astronomy, and number theory.
- Having a lunar impact crater named "Thebit" in his honor.

## Body

### Identity and Historical Context
Thābit ibn Qurra was a human member of the genus Homo sapiens originating from Mesopotamia. He lived during the era of the Abbasid Caliphate, the third Islamic caliphate which existed from 750 to 1258. His professional identity was multifaceted, encompassing roles as a mathematician, astronomer, physician, and astrologer. He is recognized as a person with extensive knowledge of mathematics and a scientist who studied celestial bodies.

### Affiliation and Institutional Work
A central part of his career was his affiliation with the House of Wisdom. This organization functioned as a library, translation institute, and research center located in medieval Baghdad. The House of Wisdom was established around the year 800 and served as the headquarters for his intellectual endeavors. Through this institution, he contributed to the broader scientific community of the Abbasid Caliphate.

### Mathematical Contributions
In the realm of pure mathematics, Thābit ibn Qurra focused heavily on number theory, a branch devoted to the study of integers. He is specifically noted for his work on amicable numbers, which are pairs of integers related by their divisors. Additionally, he is associated with a specific class of integers defined by the formula $3 \cdot 2^n - 1$ for non-negative $n$, which are now referred to as Thabit numbers. These contributions highlight his deep engagement with the properties of numbers.

### Scientific and Medical Practice
Beyond pure mathematics, his work extended into applied sciences. He practiced as a physician, applying professional medical skills to the care of patients. In the field of astronomy, he studied celestial objects and phenomena within the cosmos. He also engaged in the practice of astrology. Furthermore, he contributed to mechanics, the science concerned with physical bodies subjected to forces or displacements.

### Legacy and Recognition
The impact of Thābit ibn Qurra is commemorated in various ways within the scientific community. A lunar impact crater has been named "Thebit" in his honor, recognizing his contributions to astronomy and mathematics. His aliases include Thabit Ibn Qurra, Thabit ibn Qurra, Thabet ibn Koura, and Al-Harani. His work remains a significant part of the history of mathematics and science, with his name appearing in over 50 sitelinks across knowledge bases.

## References

1. MacTutor History of Mathematics archive
2. BnF authorities
3. Integrated Authority File
4. International Standard Name Identifier
5. Virtual International Authority File
6. A Short History of Astronomy
7. German National Library
8. Encyclopædia Universalis
9. OpenITI corpus
10. Freebase Data Dumps. 2013
11. [Source](https://books.google.cat/books?id=ndwsE1eJy3wC&pg=PP14)
12. CERL Thesaurus
13. Treccani's Enciclopedia on line
14. [Source](https://islamansiklopedisi.org.tr/sabit-b-kurre)
15. Treccani Philosophy
16. HMML Authority File