# Sergey Degayev

> Russian double agent and American mathematician (1857–1921)

**Wikidata**: [Q4156564](https://www.wikidata.org/wiki/Q4156564)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sergey_Degayev)  
**Source**: https://4ort.xyz/entity/sergey-degayev


## References

1. MacTutor History of Mathematics archive
2. Find a Grave
3. [Mathematics Genealogy Project](http://www.genealogy.ams.org/id.php?id=38306)
4. general catalog of BnF
5. Virtual International Authority File
6. Faceted Application of Subject Terminology
7. LIBRIS
8. MAK
9. Freebase Data Dumps. 2013
10. Czech National Authority Database
11. Mathematics Genealogy Project
12. National Library of Israel Names and Subjects Authority File