# Petr Hájek

> Czech logician and mathematician (1940–2016)

**Wikidata**: [Q7178527](https://www.wikidata.org/wiki/Q7178527)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Petr_Hájek)  
**Source**: https://4ort.xyz/entity/petr-hajek

## Summary
Petr Hájek was a Czech logician and mathematician (1940–2016) known for his work in mathematical logic, fuzzy logic, and artificial intelligence. He also held positions as a university teacher and organist, and was a director of the Institute of Computer Science.

## Biography
- Born: 1940-02-06, Prague
- Died: 2016-12-26, Prague
- Nationality: Czechoslovak, Czech Republic
- Education: Faculty of Mathematics and Physics, Charles University; Music and Dance Faculty of the Academy of Performing Arts in Prague
- Known for: Contributions to mathematical logic, fuzzy logic, and artificial intelligence.
- Employer(s): Czech Technical University in Prague
- Field(s): mathematical logic, set theory, fuzzy logic, organ performance, arithmetic, artificial intelligence

## Contributions
Petr Hájek made significant contributions across several fields, notably in mathematical logic, fuzzy logic, and artificial intelligence. He served as the director of the Institute of Computer Science from 1992 to 2000. His academic career saw him achieve the academic degree of docent in 1993 and professor in 1997. Hájek was a member of the Learned Society of the Czech Republic starting in 1996 and was inducted into the Academia Europaea in 2000, specifically within the AE section Informatics. He was also an organist at the Church of Saint Clemens in New Town, Prague. His work was recognized with the Czech Medal of Merit in 2006 and an honorary doctorate from Silesian University in Opava in 2008. He advised several doctoral students, including Vitezslav Svejdar, Zuzana Haniková, Petr Cintula, Jan Rauch, Jiří Ivánek, and Libor Behounek, and was himself advised by Petr Vopěnka and Karel Čulík.

## FAQs
### Q: What were Petr Hájek's main fields of study?
A: Petr Hájek's main fields of study included mathematical logic, set theory, fuzzy logic, arithmetic, and artificial intelligence. He also engaged in organ performance.

### Q: Where did Petr Hájek work?
A: Petr Hájek was employed by the Czech Technical University in Prague and served as the director of the Institute of Computer Science from 1992 to 2000.

### Q: What academic honors did Petr Hájek receive?
A: Petr Hájek received the Czech Medal of Merit in 2006 and an honorary doctorate from Silesian University in Opava in 2008. He was also a member of the Academia Europaea and the Learned Society of the Czech Republic.

### Q: Who were Petr Hájek's doctoral advisors?
A: Petr Hájek's doctoral advisors were Petr Vopěnka and Karel Čulík.

### Q: Was Petr Hájek only a mathematician?
A: No, in addition to being a mathematician and university teacher, Petr Hájek was also an organist, specifically at the Church of Saint Clemens in New Town, Prague.

## Why They Matter
Petr Hájek's work significantly advanced the understanding and application of mathematical logic, particularly in the realm of fuzzy logic and artificial intelligence. His leadership as director of the Institute of Computer Science from 1992 to 2000 indicates his influence in shaping research and development in these critical areas. His role as a university teacher and doctoral advisor to numerous students, including Vitezslav Svejdar and Petr Cintula, demonstrates his lasting impact on the next generation of researchers. Membership in prestigious organizations like the Academia Europaea and the Learned Society of the Czech Republic, alongside awards such as the Czech Medal of Merit and an honorary doctorate, underscore his recognized contributions and the high regard in which his work was held within the scientific community. His multifaceted career, spanning mathematics, computer science, and even organ performance, highlights a unique breadth of talent and intellectual curiosity.

## Notable For
- Director of the Institute of Computer Science (1992-2000).
- Member of the Academia Europaea (AE section Informatics) since 2000.
- Recipient of the Czech Medal of Merit in 2006.
- Awarded an honorary doctorate by Silesian University in Opava in 2008.
- Known for his contributions to mathematical logic, fuzzy logic, and artificial intelligence.

## Body
### Personal Life
- Petr Hájek was born on 1940-02-06 in Prague.
- He passed away on 2016-12-26 in Prague.
- His citizenship included Czechoslovakia and later the Czech Republic.
- He was married and had three children, including Jonáš Hájek.
- His cousin was Miloslav Hájek.
- His religion or worldview was the Evangelical Church of Czech Brethren.
- He was male.
- He spoke, wrote, or signed Czech.

### Education and Academic Career
- Petr Hájek was educated at the Faculty of Mathematics and Physics, Charles University.
- He also studied at the Music and Dance Faculty of the Academy of Performing Arts in Prague.
- He achieved the academic degree of docent in 1993.
- He became a professor in 1997.
- His doctoral advisors were Petr Vopěnka and Karel Čulík.
- He advised doctoral students including Vitezslav Svejdar, Zuzana Haniková, Petr Cintula, Jan Rauch, Jiří Ivánek, and Libor Behounek.
- He was employed by the Czech Technical University in Prague.

### Professional Roles and Fields of Work
- Petr Hájek was a mathematician, university teacher, and organist.
- He held the position of director at the Institute of Computer Science from 1992 to 2000.
- He was an organist at the Church of Saint Clemens in New Town, Prague.
- His fields of work included:
    - mathematical logic
    - set theory
    - fuzzy logic
    - organ performance
    - arithmetic
    - artificial intelligence

### Memberships and Awards
- He was a member of the Learned Society of the Czech Republic starting in 1996.
- He became a member of the Academia Europaea (AE section Informatics) in 2000.
- He received the Czech Medal of Merit in 2006.
- He was awarded an honorary doctorate by Silesian University in Opava in 2008.

### Identifiers
- ISNI: 0000000110732596
- GND ID: 143699024
- VIAF ID: 83719882
- IDREF ID: 057090432
- NUKAT ID: n97021465
- Bibsys ID: 90662180
- Cantic ID: 981058513542606706
- Medvik ID: jk01033078
- Prabook ID: 1954602
- Freebase ID: /m/04n2yxr
- AE Member ID: Hájek_Petr
- JRC Names ID: 6344
- MR Author ID: 79770
- NL CR Aut ID: jk01033078
- ProofWiki ID: Mathematician:Petr_Hájek
- Erdős number: 3
- KBR Person ID: 14356557
- NSK (VIAF) ID: 000609700
- SBN Author ID: MILV093877
- DBLP Author ID: 75/3354
- Yale Lux ID: person/50073249-3e6a-4675-b485-cfbb5626f016
- RERO ID (legacy): A003395384
- zbMATH Author ID: hajek.petr
- Cinii Research ID: 1140000791662276096
- DDB Person (GND) ID: 143699024
- Nacsis Cat Author ID: DA01209677
- WorldCat Entities ID: E39PBJmP9bdtpQw6y3RGvJG4MP
- Google Scholar Author ID: qs38PIIAAAAJ
- Cantic ID (former scheme): a11402180
- Databazeknih.cz Author ID: 128571
- Share Catalogue Author ID: 48949
- National Library of Korea ID: KAC202272186
- Library of Congress Authority ID: n84154773
- Mathematics Genealogy Project ID: 136316
- National Library of Lithuania ID: LNB:Cs/4;=Bb
- National Library of Israel J9U ID: 987007442718705171
- National Library of Poland MMS ID: 9810590513405606
- Bibliothèque Nationale de France ID: 12981657h
- University of Barcelona Authority ID: 981058513542606706
- Nationale Thesaurus voor Auteursnamen ID: 118674374
- Biographical Dictionary of the Czech Lands ID: 69490
- University of Barcelona Authority ID (former scheme): a1277380

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  "@type": "Person",
  "name": "Petr Hájek",
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  "birthDate": "1940-02-06",
  "birthPlace": {
    "@type": "Place",
    "name": "Prague"
  },
  "deathDate": "2016-12-26",
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  ],
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  "sameAs": [
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  "description": "Czech logician and mathematician (1940–2016) known for his work in mathematical logic, fuzzy logic, and artificial intelligence."
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## References

1. Czech National Authority Database
2. [Records of persons of interest](http://svazky.cz/test/svazkyMT.php?jmeno=Petr&prijm=Hajek&dnar=06.02.1940&hledej=Hledat)
3. A small dictionary of Czech non-Catholic religious figures of the 20th and 21st centuries
4. Mathematics Genealogy Project
5. International Standard Name Identifier
6. Virtual International Authority File
7. CiNii Research
8. www.ae-info.org
9. Google Knowledge Graph
10. [Source](http://svazky.cz/test/svazkyMT.php?jmeno=Petr&prijm=Hajek&dnar=06.02.1940&hledej=Hledat)
11. Autoritats UB
12. [Source](https://math.fel.cvut.cz/en/people/hajekpe8/CV%20short-2024.pdf)
13. National Library of Israel Names and Subjects Authority File