World's Best Scientists 2026 revealed!
Juhani Karhumäki

Juhani Karhumäki

D-Index & Metrics

Mathematics

D-Index
30
Citations
4083
World Ranking
3503
National Ranking
25

Juhani Karhumäki publication distribution in Mathematics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Mathematics in 2026. The highlighted bar marks where Juhani Karhumäki sits on this spectrum.

42–46 publications: 3 scientists 47–51 publications: 5 scientists 52–56 publications: 7 scientists 57–61 publications: 20 scientists 62–66 publications: 14 scientists 67–71 publications: 25 scientists 72–76 publications: 19 scientists 77–81 publications: 35 scientists 82–86 publications: 50 scientists 87–91 publications: 60 scientists 92–96 publications: 86 scientists 97–101 publications: 84 scientists 102–106 publications: 83 scientists 107–111 publications: 90 scientists 112–116 publications: 99 scientists 117–121 publications: 90 scientists 122–126 publications: 91 scientists 127–131 publications: 109 scientists 132–136 publications: 110 scientists 137–141 publications: 98 scientists 142–146 publications: 112 scientists 147–151 publications: 102 scientists 152–156 publications: 88 scientists 157–161 publications: 106 scientists 162–166 publications: 83 scientists 167–171 publications: 102 scientists 172–176 publications: 77 scientists 177–181 publications: 81 scientists 182–186 publications: 78 scientists 187–191 publications: 71 scientists 192–196 publications: 92 scientists 197–201 publications: 64 scientists 202–206 publications: 69 scientists 207–211 publications: 64 scientists 212–216 publications: 62 scientists 217–221 publications: 58 scientists 222–226 publications: 53 scientists 227–231 publications: 50 scientists 232–236 publications: 46 scientists 237–241 publications: 46 scientists 242–246 publications: 46 scientists 247–251 publications: 43 scientists 252–256 publications: 29 scientists 257–261 publications: 45 scientists 262–266 publications: 30 scientists 267–271 publications: 33 scientists 272–276 publications: 34 scientists 277–281 publications: 30 scientists 282–286 publications: 31 scientists 287–291 publications: 21 scientists 292–296 publications: 34 scientists 297–301 publications: 26 scientists 302–306 publications: 10 scientists 307–311 publications: 17 scientists 312–316 publications: 23 scientists 317–321 publications: 13 scientists 322–326 publications: 16 scientists 327–331 publications: 26 scientists 332–336 publications: 13 scientists 337–341 publications: 13 scientists 342–346 publications: 16 scientists 347–351 publications: 17 scientists 352–356 publications: 12 scientists 357–361 publications: 18 scientists 362–366 publications: 18 scientists 367–371 publications: 9 scientists 372–376 publications: 11 scientists 377–381 publications: 8 scientists 382–386 publications: 8 scientists 387–391 publications: 9 scientists 392–396 publications: 9 scientists 397–401 publications: 8 scientists 402–406 publications: 11 scientists 407–411 publications: 6 scientists 412–416 publications: 6 scientists 417–421 publications: 9 scientists 422–426 publications: 8 scientists 427–431 publications: 5 scientists 432–436 publications: 8 scientists 437–441 publications: 8 scientists 442–446 publications: 4 scientists 447–451 publications: 4 scientists 452–456 publications: 4 scientists 457–461 publications: 2 scientists 462–466 publications: 2 scientists 467–471 publications: 4 scientists 472–476 publications: 3 scientists 477–481 publications: 3 scientists 482–486 publications: 6 scientists 487–491 publications: 3 scientists 492–496 publications: 5 scientists 497–501 publications: 5 scientists 502–506 publications: 1 scientists 507–511 publications: 6 scientists 512–516 publications: 4 scientists 517–521 publications: 1 scientists 522–526 publications: 3 scientists 527–531 publications: 1 scientists 532–536 publications: 4 scientists 537+ publications: 100 scientists
42 publications 537+

This scientist: 230 publications — 72nd percentile

72% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 537 publications or more.

Juhani Karhumäki D-index placement in Mathematics in 2026

The chart shows the D-index (discipline H-index) distribution of Mathematics scientists ranked by Research.com in 2026. The highlighted bar marks where Juhani Karhumäki sits on this spectrum.

30 D-Index: 174 scientists 31 D-Index: 151 scientists 32 D-Index: 174 scientists 33 D-Index: 117 scientists 34 D-Index: 136 scientists 35 D-Index: 127 scientists 36 D-Index: 145 scientists 37 D-Index: 153 scientists 38 D-Index: 150 scientists 39 D-Index: 150 scientists 40 D-Index: 138 scientists 41 D-Index: 136 scientists 42 D-Index: 93 scientists 43 D-Index: 108 scientists 44 D-Index: 115 scientists 45 D-Index: 112 scientists 46 D-Index: 103 scientists 47 D-Index: 75 scientists 48 D-Index: 59 scientists 49 D-Index: 67 scientists 50 D-Index: 60 scientists 51 D-Index: 57 scientists 52 D-Index: 59 scientists 53 D-Index: 62 scientists 54 D-Index: 60 scientists 55 D-Index: 50 scientists 56 D-Index: 42 scientists 57 D-Index: 54 scientists 58 D-Index: 50 scientists 59 D-Index: 42 scientists 60 D-Index: 41 scientists 61 D-Index: 35 scientists 62 D-Index: 40 scientists 63 D-Index: 21 scientists 64 D-Index: 31 scientists 65 D-Index: 27 scientists 66 D-Index: 29 scientists 67 D-Index: 19 scientists 68 D-Index: 25 scientists 69 D-Index: 17 scientists 70 D-Index: 18 scientists 71 D-Index: 12 scientists 72 D-Index: 14 scientists 73 D-Index: 13 scientists 74 D-Index: 18 scientists 75 D-Index: 9 scientists 76 D-Index: 11 scientists 77 D-Index: 10 scientists 78 D-Index: 9 scientists 79 D-Index: 16 scientists 80 D-Index: 12 scientists 81 D-Index: 10 scientists 82 D-Index: 5 scientists 83 D-Index: 5 scientists 84 D-Index: 13 scientists 85 D-Index: 6 scientists 86+ D-Index: 99 scientists
30 D-Index 86+

This scientist: 30 D-Index — 5th percentile

5% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 86 D-Index or more.

Research.com Recognitions

  • 2006 - Member of Academia Europaea

Overview

Juhani Karhumäki is affiliated with the University of Turku in Finland and specializes primarily in computer science with a focus on computational theory and mathematics. Their research spans several subfields including artificial intelligence, computer vision and pattern recognition, geometry and topology, and electrical and electronic engineering.

The scientist's work explores a variety of topics including:

  • Semigroups and automata theory
  • Machine learning and algorithms
  • Computability, logic, AI algorithms
  • Advanced algebra and logic
  • Handwritten text recognition techniques
  • Geometric and algebraic topology
  • Coding theory and cryptography

Several recent research papers authored by Juhani Karhumäki demonstrate contributions to theoretical computer science and related areas. These include:

  • "On cardinalities of k-abelian equivalence classes," 2022, published in UTUPub (University of Turku)
  • "A compactness property of the k-abelian monoids," 2020, published in Theoretical Computer Science
  • "On abelian closures of infinite non-binary words," 2024, published in Discrete Mathematics
  • "On Abelian Closures of Infinite Non-binary Words," 2020, published in arXiv (Cornell University)

The scientist has also contributed to foundational texts, including a book titled Finite transducers and rational transductions published by EMS Press eBooks in 2021.

Collaboration has been a significant aspect of their work, with frequent co-authors including Markus A. Whiteland, Svetlana Puzynina, Fabian Frei, Juraj Hromkovič, and Jarkko Kari. These professional partnerships extend across multiple scholarly articles and research projects.

Juhani Karhumäki's research has appeared in various publication venues, reflecting an engagement with diverse academic communities. Key venues where their work has been published include:

  • Theoretical Computer Science
  • Fundamenta Informaticae
  • UTUPub (University of Turku)
  • arXiv (Cornell University)
  • Discrete Mathematics

In recognition of their contributions, Juhani Karhumäki was inducted as a member of Academia Europaea in 2006.

Best Publications

  • Combinatorics of words

    Christian Choffrut;Juhani Karhumäki

  • The equivalence problem of multitape finite automata

    T. Harju;J. Karhumäki

  • Combinatorics on words: a tutorial.

    Jean Berstel;Juhani Karhumäki

  • The (generalized) post correspondence problem with lists consisting of two words is decidable

    Andrzej Ehrenfeucht;Juhani Karhumäki;Grzegorz Rozenberg

  • Sofsem 2008: Theory and Practice of Computer Science

    Costas Iliopoulos;M S Rahman;Geffert;J Karhumaki

  • Finite Automata Computing Real Functions

    Karel Culik;Juhani Karhumaki

  • The expressibility of languages and relations by word equations

    Juhani Karhumäki;Filippo Mignosi;Wojciech Plandowski

  • On cube-free ω-words generated by binary morphisms

    Juhani Karhumäki

  • Communication complexity method for measuring nondeterminism in finite automata

    Juraj Karhuäki;Sebastian Seibert;Juhani Karhumaki;Hartmut Klauck

  • Systems of equations over a free monoid and Ehrenfeucht's conjecture

    Karel Culik;Juhani Karhumäki

  • Jewels are Forever

    Juhani Karhumäki;Hermann Maurer;Gheorghe Păun;Grzegorz Rozenberg

  • Polynomial versus exponential growth in repetition-free binary words

    Juhani Karhumäki;Jeffrey Shallit

  • The Equivalence of Finite Valued Transducers (on HDTOL Languages) is Decidable

    Karel Culik;Juhani Karhumäki

  • ON THE UNDECIDABILITY OF FREENESS OF MATRIX SEMIGROUPS

    Julien Cassaigne;Tero Harju;Juhani Karhumäki

  • On a generalization of Abelian equivalence and complexity of infinite words

    Juhani Karhumaki;Aleksi Saarela;Luca Q. Zamboni

  • Toeplitz Words, Generalized Periodicity and Periodically Iterated Morphisms

    Julien Cassaigne;Juhani Karhumäki

  • Some Decision Problems Concerning Semilinearity and Commutation

    Tero Harju;Oscar H. Ibarra;Juhani Karhumäki;Arto Salomaa

  • A NOTE ON SYNCHRONIZED AUTOMATA AND ROAD COLORING PROBLEM

    Karel Culik;Juhani Karhumäki;Jarkko Kari

  • The commutation of finite sets: a challenging problem

    Christian Choffrut;Juhani Karhumaki;Nicolas Ollinger

  • Test sets for context free languages and algebraic systems of equations over a free monoid

    Jürgen Albert;Karel Culík;Juhani Karhumäki

  • Generalized Parikh Mappings and Homomorphisms

    Juhani Karhumäki

  • Some decision problems on integer matrices

    Christian Choffrut;Juhani Karhumäki

Frequent Co-Authors

Karel Culik
Karel Culik University of South Carolina
Grzegorz Rozenberg
Grzegorz Rozenberg Leiden University
Wojciech Rytter
Wojciech Rytter University of Warsaw
Arto Salomaa
Arto Salomaa Turku Centre for Computer Science
Oscar H. Ibarra
Oscar H. Ibarra University of California, Santa Barbara
Jan Willem Klop
Jan Willem Klop Vrije Universiteit Amsterdam
Andrzej Ehrenfeucht
Andrzej Ehrenfeucht University of Colorado Boulder
Hartmut Ehrig
Hartmut Ehrig Technical University of Berlin
Jeffrey Shallit
Jeffrey Shallit University of Waterloo
Donald Sannella
Donald Sannella University of Edinburgh

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