Helmut A. Hamm

804 total citations
21 papers, 386 citations indexed

About

Helmut A. Hamm is a scholar working on Geometry and Topology, Algebra and Number Theory and Mathematical Physics. According to data from OpenAlex, Helmut A. Hamm has authored 21 papers receiving a total of 386 indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Geometry and Topology, 9 papers in Algebra and Number Theory and 6 papers in Mathematical Physics. Recurrent topics in Helmut A. Hamm's work include Algebraic Geometry and Number Theory (9 papers), Commutative Algebra and Its Applications (6 papers) and Homotopy and Cohomology in Algebraic Topology (6 papers). Helmut A. Hamm is often cited by papers focused on Algebraic Geometry and Number Theory (9 papers), Commutative Algebra and Its Applications (6 papers) and Homotopy and Cohomology in Algebraic Topology (6 papers). Helmut A. Hamm collaborates with scholars based in Germany, France and Italy. Helmut A. Hamm's co-authors include Lê Dũng Tráng and Gert–Martin Greuel and has published in prestigious journals such as Inventiones mathematicae, Mathematische Annalen and Annales Scientifiques de l École Normale Supérieure.

In The Last Decade

Helmut A. Hamm

15 papers receiving 288 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Helmut A. Hamm Germany 8 318 173 119 73 67 21 386
Oswald Riemenschneider Germany 10 377 1.2× 185 1.1× 112 0.9× 55 0.8× 115 1.7× 23 436
C. P. Ramanujam India 7 311 1.0× 137 0.8× 109 0.9× 74 1.0× 62 0.9× 8 352
Robert Silhol France 9 240 0.8× 132 0.8× 46 0.4× 77 1.1× 37 0.6× 25 272
Ludwig Bröcker Germany 9 231 0.7× 102 0.6× 106 0.9× 87 1.2× 102 1.5× 19 330
Steven Diaz United States 9 207 0.7× 102 0.6× 55 0.5× 58 0.8× 41 0.6× 23 229
Alan H. Durfee United States 11 312 1.0× 182 1.1× 53 0.4× 63 0.9× 47 0.7× 20 368
J. J. Nuño‐Ballesteros Spain 9 245 0.8× 127 0.7× 63 0.5× 63 0.9× 84 1.3× 73 296
Alberto Tognoli Italy 10 243 0.8× 155 0.9× 78 0.7× 74 1.0× 55 0.8× 34 300
Mihai Tibăr France 12 338 1.1× 157 0.9× 75 0.6× 84 1.2× 50 0.7× 50 376
Kazuhiro Konno Japan 9 287 0.9× 83 0.5× 56 0.5× 51 0.7× 99 1.5× 40 289

Countries citing papers authored by Helmut A. Hamm

Since Specialization
Citations

This map shows the geographic impact of Helmut A. Hamm's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Helmut A. Hamm with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Helmut A. Hamm more than expected).

Fields of papers citing papers by Helmut A. Hamm

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Helmut A. Hamm. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Helmut A. Hamm. The network helps show where Helmut A. Hamm may publish in the future.

Co-authorship network of co-authors of Helmut A. Hamm

This figure shows the co-authorship network connecting the top 25 collaborators of Helmut A. Hamm. A scholar is included among the top collaborators of Helmut A. Hamm based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Helmut A. Hamm. Helmut A. Hamm is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Hamm, Helmut A. & Lê Dũng Tráng. (2010). Théorèmes d'annulation et groupes de Picard. 13–38.
2.
Hamm, Helmut A.. (2009). On the local Picard group. Proceedings of the Steklov Institute of Mathematics. 267(1). 131–138.
3.
Hamm, Helmut A., et al.. (2007). A LEFSCHETZ THEOREM ON THE PICARD GROUP OF COMPLEX PROJECTIVE VARIETIES. 640–660. 1 indexed citations
4.
Hamm, Helmut A.. (2005). ON THE PICARD GROUP FOR NON-COMPLETE ALGEBRAIC VARIETIES. OpenGrey (Institut de l'Information Scientifique et Technique). 3 indexed citations
5.
Hamm, Helmut A.. (1999). ON STRATIFIED MORSE THEORY. Topology. 38(2). 427–438. 13 indexed citations
6.
Hamm, Helmut A. & Lê Dũng Tráng. (1998). Théorèmes d'annulation pour les faisceaux algébriquement constructibles. Comptes Rendus de l Académie des Sciences - Series I - Mathematics. 327(8). 759–762. 1 indexed citations
7.
Hamm, Helmut A., et al.. (1998). Vanishing theorems for constructible sheaves. II.. Kodai Mathematical Journal. 21(2). 4 indexed citations
8.
Hamm, Helmut A., et al.. (1997). Deformation retracts of Stein spaces. Mathematische Annalen. 308(2). 333–345. 5 indexed citations
9.
Hamm, Helmut A., et al.. (1993). Relative homotopical depth and a conjecture of Deligne. Mathematische Annalen. 296(1). 87–101. 1 indexed citations
10.
Hamm, Helmut A.. (1988). Morse theory on singular spaces and Lefschetz theorems. Banach Center Publications. 20(1). 223–237. 3 indexed citations
11.
Hamm, Helmut A.. (1986). Zum Homotopietyp q-vollständiger Räume.. Journal für die reine und angewandte Mathematik (Crelles Journal). 1986(364). 1–9. 12 indexed citations
12.
Hamm, Helmut A. & Lê Dũng Tráng. (1985). Lefschetz theorems on quasi-projective varieties. Bulletin de la Société mathématique de France. 79. 123–142. 30 indexed citations
13.
Hamm, Helmut A.. (1983). Zum Homotopietyp Steinscher Räume.. Journal für die reine und angewandte Mathematik (Crelles Journal). 1983(338). 121–135. 23 indexed citations
14.
Hamm, Helmut A.. (1981). On the vanishing of local homotopy groups for isolated singularities of complex spaces.. Journal für die reine und angewandte Mathematik (Crelles Journal). 1981(323). 172–176. 3 indexed citations
15.
Greuel, Gert–Martin & Helmut A. Hamm. (1978). Invarianten quasihomogener vollst�ndiger Durchschnitte. Inventiones mathematicae. 49(1). 67–86. 40 indexed citations
16.
Hamm, Helmut A.. (1977). GenusXy of quasihomogeneous complete intersections. Functional Analysis and Its Applications. 11(1). 78–79. 3 indexed citations
17.
Hamm, Helmut A.. (1975). Ein Beispiel zur Berechnung der Picard-Lefschetz-Monodromie f�r nichtisolierte Hyperfl�chensingularit�ten. Mathematische Annalen. 214(3). 221–234. 3 indexed citations
18.
Hamm, Helmut A. & Lê Dũng Tráng. (1973). Un théorème de Zariski du type de Lefschetz. Annales Scientifiques de l École Normale Supérieure. 6(3). 317–355. 92 indexed citations
19.
Hamm, Helmut A.. (1972). Exotische Sph�ren als Umgebungsr�nder in speziellen komplexen R�umen. Mathematische Annalen. 197(1). 44–56. 25 indexed citations
20.
Hamm, Helmut A.. (1971). Lokale topologische Eigenschaften komplexer Räume. Mathematische Annalen. 191(3). 235–252. 122 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Oswald Riemenschneider Breakdown of academic impact, for papers by C. P. Ramanujam Breakdown of academic impact, for papers by Robert Silhol Breakdown of academic impact, for papers by Ludwig Bröcker Breakdown of academic impact, for papers by Steven Diaz Breakdown of academic impact, for papers by Alan H. Durfee Breakdown of academic impact, for papers by J. J. Nuño‐Ballesteros Breakdown of academic impact, for papers by Alberto Tognoli Breakdown of academic impact, for papers by Mihai Tibăr Breakdown of academic impact, for papers by Kazuhiro Konno
Rankless by CCL
2026