Journal profile · Mathematics-Statistics and Probability
Forum of Mathematics Sigma
ISSN 2050-5094 · Cambridge University Press · ENGLAND
Forum of Mathematics Sigma: CAS Zone 2 · Mathematics (2025 upgraded edition, Top journal); impact factor 1.3; fully open access; APC about USD 2,740; review about 40 weeks (community reports); 198 articles in 2025; indexed in SCIE and Scopus.
Scope
Aims, scope and focus
Forum of Mathematics Sigma is published by Cambridge University Press and is in Zone 2 of Mathematics in the CAS Journal Ranking (2025 upgraded edition, Top journal). By OpenAlex counts of its recent articles, its largest topics are Algebraic Geometry and Number Theory, Advanced Algebra and Geometry and Algebraic structures and combinatorial models, together about 35.8% of its articles. Its main subfields are Geometry and Topology and Discrete Mathematics and Combinatorics. (generated from OpenAlex topic counts and CAS ranking data)
Forum of Mathematics, Sigma is the open access alternative to the leading specialist mathematics journals. Editorial decisions are made by dedicated clusters of editors concentrated in the following areas: foundations of mathematics, discrete mathematics, algebra, number theory, algebraic and complex geometry, differential geometry and geometric analysis, topology, analysis, probability, differential equations, computational mathematics, applied analysis, mathematical physics, and theoretical computer science. This classification exists to aid the peer review process. Contributions which do not neatly fit within these categories are still welcome.Forum of Mathematics, Pi and Forum of Mathematics, Sigma are an exciting new development in journal publishing. Together they offer fully open access publication combined with peer-review standards set by an international editorial board of the highest calibre, and all backed by Cambridge University Press and our commitment to quality. Strong research papers from all parts of pure mathematics and related areas will be welcomed. All published papers will be free online to readers in perpetuity.
From the journal's Aims & Scope
Research area (LetPub): Mathematics-Statistics and Probability
Main research topics OpenAlex counts of recent articles; shares are approximate
- Algebraic Geometry and Number TheoryMathematics14.9%
- Advanced Algebra and GeometryMathematics12.3%
- Algebraic structures and combinatorial modelsMathematics8.6%
- Homotopy and Cohomology in Algebraic TopologyMathematics7%
- Geometric and Algebraic TopologyMathematics5.4%
- Advanced Combinatorial MathematicsMathematics5%
- Advanced Topics in AlgebraMathematics4.1%
- Limits and Structures in Graph TheoryMathematics3.9%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Mathematics Zone 2
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 2 |
| Minor | Mathematics | Zone 2 |
| Minor | Mathematics, Applied | Zone 2 |
Top journal: yesReview journal: no
CAS Xinrui Journal Ranking (March 2026)Mathematics Zone 2
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 2 |
| Minor | Mathematics, Applied | Zone 2 |
| Minor | Mathematics | Zone 2 |
Top journal: yesReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Mathematics Zone 2
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 2 |
| Minor | Mathematics, Applied | Zone 1 |
| Minor | Mathematics | Zone 2 |
Top journal: noReview journal: no
Database indexing
SCIEScopusDOAJLetPub
International journal early-warning lists: not listed in any editionLetPub
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor
- 1.3LetPub ·
- Impact factor (publisher) 2025
- 95Publisher website ·
- CiteScore 2026-06
- 1.9LetPub ·
- SJR 2026-06
- 1.64LetPub ·
- SNIP 2026-06
- 1.37LetPub ·
- h-index
- 35OpenAlex ·
- i10-index
- 198OpenAlex ·
- 2-year mean citedness
- 1.26OpenAlex ·
- Self-citation rate
- 0%LetPub ·
- Share of gold OA articles
- 99.54%LetPub ·
Volume
- Articles per year
- 194LetPub ·
Articles by year OpenAlex count · 1,037 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 132 | 132 | 28 |
| 2025 | 198 | 198 | 209 |
| 2024 | 128 | 128 | 340 |
| 2023 | 117 | 117 | 511 |
| 2022 | 117 | 117 | 744 |
| 2021 | 82 | 82 | 588 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Review & acceptance
Review time and acceptance
- Average review time (community reports)
- about 40 weeksLetPub ·
- Submission to publication (journal-reported)
- about 65 weeksDOAJ ·
- Peer review
- Unspecified peer reviewDOAJ
Community reports come from authors' own submissions (confidence 0.5) and are not a promise from the journal; for publisher figures, the journal's own definitions apply.
Fees & open access
APC and open-access policy
Fully open accessDOAJ
Every article is open access; authors usually pay an article processing charge (APC).
| Source | APC | Fee waiver | License | Observed |
|---|---|---|---|---|
| DOAJ | USD 2,740 / GBP 1,960 | Yes | CC BY, CC BY-SA, CC BY-ND, CC BY-NC, CC BY-NC-SA, CC BY-NC-ND | |
| OpenAlex | USD 2,650 / GBP 1,850 | — | — |
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Submission
Article types and submission policies (journal website)
Article types accepted2
- articleWe accept the following types of articles: Article* Research Article*Length not stated
- research articleWe accept the following types of articles: Article* Research Article*Length not stated
Excerpts are quoted from the journal's website; "model summary" lines are written by Workers AI and checked against the text. The journal's website is authoritative.
Profile
Publication details and official links
- Publisher
- Cambridge University Press
- Country or region
- ENGLAND
- Language
- English
- ISSN
- 2050-5094
- Official links
FAQ
Frequently asked questions about Forum of Mathematics Sigma
What CAS zone is Forum of Mathematics Sigma in?
In the 2025 upgraded edition of the CAS Journal Ranking, Forum of Mathematics Sigma is in Zone 2 of Mathematics, and in Zone 2 of the minor category Mathematics / Mathematics, Applied; it is a Top journal. In the 2026 Xinrui edition it is in Zone 2 of Mathematics. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of Forum of Mathematics Sigma?
The latest impact factor listed by LetPub is 1.3; CiteScore 1.9, h-index 35.
How long does peer review take at Forum of Mathematics Sigma?
Authors report an average review time of about 40 weeks. Article statistics cover accepted papers only, publisher figures follow the journal's own definitions, and community reports come from authors' own submissions; none is a promise from the journal.
Which databases index Forum of Mathematics Sigma?
According to LetPub and DOAJ records, Forum of Mathematics Sigma is indexed in SCIE, Scopus and DOAJ.
Is Forum of Mathematics Sigma open access, and what is the APC?
Forum of Mathematics Sigma is a fully open-access journal. APC about USD 2,740.
Sources and updates
The facts on this page come from LetPub, OpenAlex, DOAJ, Publisher website; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-25). Last updated: .