Journal profile · Mathematics
Integral Equations and Operator Theory
ISSN 0378-620X · eISSN 1420-8989 · Springer International Publishing · SWITZERLAND · Monthly · Founded 1978
Integral Equations and Operator Theory: CAS Zone 3 · Mathematics (2025 upgraded edition); impact factor 0.98; hybrid open access; APC about USD 3,290; median 199 days to acceptance (84 articles, last 24 months); community-reported acceptance: easy; 29 articles in 2025; indexed in SCIE and Scopus.
Scope
Aims, scope and focus
Integral Equations and Operator Theory is published by Springer International Publishing and is in Zone 3 of Mathematics in the CAS Journal Ranking (2025 upgraded edition). By OpenAlex counts of its recent articles, its largest topics are Holomorphic and Operator Theory, Spectral Theory in Mathematical Physics and Advanced Topics in Algebra, together about 39.1% of its articles. Its main subfields are Applied Mathematics and Mathematical Physics. (generated from OpenAlex topic counts and CAS ranking data)
Integral Equations and Operator Theory (IEOT) is devoted to the publication of current research in integral equations, operator theory and related topics with emphasis on the linear aspects of the theory. The journal reports on the full scope of current developments from abstract theory to numerical methods and applications to analysis, physics, mechanics, engineering and others. The journal consists of two sections: a main section consisting of refereed papers and a second consisting of short announcements of important results, open problems, information, etc.
From the journal's Aims & Scope
Research area (LetPub): Mathematics
Editor-in-chief Christiane TretterPublisher website
Editorial board by country: none in mainland China; most named United States 16, Israel 6, Germany 5, Netherlands 4, Austria 3 (43 members with a country) Editorial board ↗Publisher website ·
Main research topics OpenAlex counts of recent articles; shares are approximate
- Holomorphic and Operator TheoryMathematics19.5%
- Spectral Theory in Mathematical PhysicsMathematics11.7%
- Advanced Topics in AlgebraMathematics8%
- Algebraic and Geometric AnalysisMathematics8%
- Matrix Theory and AlgorithmsComputer Science7.4%
- Advanced Operator Algebra ResearchMathematics5.6%
- Advanced Banach Space TheoryMathematics4.7%
- Advanced Harmonic Analysis ResearchMathematics4.5%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Mathematics Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 3 |
| Minor | Mathematics | Zone 3 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Mathematics Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 3 |
| Minor | Mathematics | Zone 3 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Mathematics Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 3 |
| Minor | Mathematics | Zone 3 |
Top journal: noReview journal: no
Database indexing
SCIEScopusLetPub
International journal early-warning lists: not listed in any editionLetPub
Indexing the journal's website claims
zbMATHCurrent ContentsPublisher website
Other: Google Scholar, EBSCO, ProQuest, Dimensions, CNKI, Baidu, Naver, OCLC, Portico, CLOCKSS
As the journal's website lists them, not checked against each database; for Web of Science editions the records above apply.
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
- 0.98LetPub ·
- Impact factor (publisher) 2025
- 1Publisher website ·
- 5-year impact factor (publisher) 2025
- 0.9Publisher website ·
- CiteScore 2026-06
- 1.6LetPub ·
- SJR 2026-06
- 0.58LetPub ·
- SNIP 2026-06
- 1.07LetPub ·
- h-index
- 40LetPub ·
- h-index
- 78OpenAlex ·
- i10-index
- 1,267OpenAlex ·
- 2-year mean citedness
- 0.75OpenAlex ·
- Self-citation rate
- 10%LetPub ·
- Share of gold OA articles
- 38.3%LetPub ·
Volume
- Articles per year
- 31LetPub ·
- Downloads per year (publisher) 2025
- 92,100Publisher website ·
Articles by year OpenAlex count · 3,144 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 47 | 35 | 2 |
| 2025 | 29 | 16 | 20 |
| 2024 | 38 | 23 | 63 |
| 2023 | 28 | 14 | 76 |
| 2022 | 41 | 20 | 125 |
| 2021 | 67 | 40 | 340 |
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
Review time from article dates manuscript dates registered with Crossref · to
199 daysMedian, submission to acceptance · P25–P75 127 days – 303 days
- Acceptance to online
- median 28 days (84 articles)
- Submission to online
- median 233 days
- Sample
- 84 articles with submission and acceptance dates (81 in the window); the latest was accepted on
Only articles that were accepted and published are counted, not the time spent on rejected manuscripts, so this usually runs longer than a publisher's "time to first decision".
Other sources
- Average review time (community reports)
- about 6 monthsLetPub ·
- Average acceptance (community reports)
- EasyLetPub ·
- Submission to first decision
- 26 daysPublisher website ·
- Peer review
- Double anonymous peer reviewPublisher website
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
Hybrid open accessLetPub
A subscription journal in which authors can pay to publish their article open access.
| Source | APC | Fee waiver | License | Observed |
|---|---|---|---|---|
| OpenAlex | USD 3,290 / EUR 2,690 / GBP 2,390 | — | — | |
| Publisher website | Yes, amount not published | — | — |
A hybrid journal charges the APC only when the author chooses open access; publishing under the subscription model is usually free.
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)
What to prepare3 items from the author guidelines
- Abstract
- 150–250 words
- Keywords
- ≥ 4
- Suggested reviewers
- Optional
Policy excerpts from the journal's websiteConflicts of interest, Data availability, Publication ethics, Open access, Peer review
- Conflicts of interest Competing Interests
Authors are requested to disclose interests that are directly or indirectly related to the work submitted for publication. Interests within the last 3 years of beginning the work (conducting the research and preparing the work for submission) should be reported. Interests outside the 3-year time frame must be disclosed if they could reasonably be perceived as influencing the submitted work. Disclo…
Source ↗Publisher website ·- Data availability Data availability statements
Data availability statement required Model summary
All original research must include a data availability statement. This statement should explain how to access data supporting the results and analysis in the article, including links/citations to publicly archived datasets analysed or generated during the study. Please see our full policy here. If it is not possible to share research data publicly, for instance when individual privacy could be com…
Source ↗Publisher website ·- Publication ethics
Competing interests disclosure required Model summary
Authors are required to disclose financial or non-financial interests that are directly or indirectly related to the work submitted for publication.
Source ↗Publisher website ·- Open access Open access publishing
To find out more about publishing your work Open Access in Integral Equations and Operator Theory, including information on fees, funding and licences, visit our Open access publishing page. Back to top
Source ↗Publisher website ·- Peer review
Reviewer suggestions allowed Model summary
Authors are welcome to suggest suitable reviewers and/or request the exclusion of certain individuals when they submit their manuscripts.
Source ↗Publisher website ·
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
- Springer International Publishing
- Country or region
- SWITZERLAND
- Language
- English
- Frequency
- Monthly
- Founded
- 1978
- ISSN
- 0378-620X
- Electronic ISSN
- 1420-8989
- Official links
- Journal homepage ↗OpenAlex
- Submission system ↗LetPub
- Author guidelines ↗LetPub
- Special issues ↗Publisher website
FAQ
Frequently asked questions about Integral Equations and Operator Theory
What CAS zone is Integral Equations and Operator Theory in?
In the 2025 upgraded edition of the CAS Journal Ranking, Integral Equations and Operator Theory is in Zone 3 of Mathematics, and in Zone 3 of the minor category Mathematics. In the 2026 Xinrui edition it is in Zone 3 of Mathematics. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of Integral Equations and Operator Theory?
The latest impact factor listed by LetPub is 0.98; CiteScore 1.6, h-index 78.
How long does peer review take at Integral Equations and Operator Theory?
Based on the dates recorded on 84 articles published between October 2024 and October 2026 (the last 24 months), the median time from submission to acceptance is 199 days (interquartile range 127–303 days); authors report an average review time of about 6 months; the community-reported acceptance is “Easy”. 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.
What are the manuscript requirements of Integral Equations and Operator Theory?
According to the journal's author guidelines: Abstract: 150–250 words; Keywords: ≥ 4; Suggested reviewers: Optional. A model extracted these from the author guidelines and each was checked against the text; check the latest version on the journal's website before submitting.
Where are the editorial board members of Integral Equations and Operator Theory based?
Of the 43 board members whose country the journal's board page names, none are in mainland China; the countries named most often are United States (16), Israel (6) and Germany (5). Counted from the institutions listed on the board page; for reference only.
Which databases index Integral Equations and Operator Theory?
According to LetPub and DOAJ records, Integral Equations and Operator Theory is indexed in SCIE and Scopus. The journal's website also lists zbMATH and Current Contents; that list has not been checked against each database.
Is Integral Equations and Operator Theory open access, and what is the APC?
Integral Equations and Operator Theory is a hybrid journal. For open-access publication: APC about USD 3,290.
Sources and updates
The facts on this page come from LetPub, OpenAlex, 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 2026-08-26). Last updated: .