Biography:Viliam Geffert

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Viliam Geffert
Born1955 (age 64–65)
Alma materP. J. Šafárik University, Comenius University
Known forstate complexity, small-space complexity
Scientific career
FieldsAutomata theory, computational complexity
InstitutionsP. J. Šafárik University

Viliam Geffert (born 1955) is a Slovak theoretical computer scientist known for his contributions to the computational complexity theory in sublogarithmic space[1][2] and to the state complexity of two-way finite automata.[3][4] He has also developed new in-place sorting algorithms.[5][6] He is a professor and the head of the computer science department at the P. J. Šafárik University in Košice.


Geffert did his undergraduate studies at the P. J. Šafárik University, graduating in 1979. He earned his PhD degree in 1988 from the Comenius University in Bratislava. Since 2003, he is a full professor of the P. J. Šafárik University.


  1. Geffert, Viliam (1993). "Tally Versions of the Savitch and Immerman–Szelepcsényi Theorems for Sublogarithmic Space". SIAM Journal on Computing 22 (1): 102–113. doi:10.1137/0222009. ISSN 0097-5397. 
  2. Geffert, Viliam; Mereghetti, Carlo; Pighizzini, Giovanni (1998). "Sublogarithmic Bounds on Space and Reversals". SIAM Journal on Computing 28 (1): 325–340. doi:10.1137/S0097539796301306. ISSN 0097-5397. 
  3. Geffert, Viliam (2012). "An alternating hierarchy for finite automata". Theoretical Computer Science 445: 1–24. doi:10.1016/j.tcs.2012.04.044. ISSN 0304-3975. 
  4. Geffert, Viliam; Mereghetti, Carlo; Pighizzini, Giovanni (2007). "Complementing two-way finite automata". Information and Computation 205 (8): 1173–1187. doi:10.1016/j.ic.2007.01.008. ISSN 0890-5401. 
  5. Franceschini, Gianni; Geffert, Viliam (2005). "An in-place sorting with O(nlog n) comparisons and O(n) moves". Journal of the ACM 52 (4): 515–537. doi:10.1145/1082036.1082037. ISSN 0004-5411. 
  6. Geffert, Viliam; Gajdoš, Jozef (2011). In-Place Sorting. 6543. pp. 248–259. doi:10.1007/978-3-642-18381-2_21. ISSN 0302-9743. Bibcode2011LNCS.6543..248G. 

External links[edit]

Documentation[create] Geffert was the original source. Read more.