Journal profile · Mathematics
Complex Analysis and Operator Theory
ISSN 1661-8254 · eISSN 1661-8262 · Springer International Publishing · SWITZERLAND · Quarterly · Founded 2007
Complex Analysis and Operator Theory: CAS Zone 4 · Mathematics (2025 upgraded edition); impact factor 0.99; hybrid open access; APC about USD 3,090; median 117 days to acceptance (102 articles, last 24 months); community-reported acceptance: about 50%; 244 articles in 2025; indexed in SCIE and Scopus.
Scope
Aims, scope and focus
Complex Analysis and Operator Theory is published by Springer International Publishing and is in Zone 4 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, Algebraic and Geometric Analysis and Spectral Theory in Mathematical Physics, together about 41.8% of its articles. Its main subfields are Applied Mathematics and Mathematical Physics. (generated from OpenAlex topic counts and CAS ranking data)
Complex Analysis and Operator Theory (CAOT) is devoted to the publication of current research developments in the closely related fields of complex analysis and operator theory as well as in applications to system theory, harmonic analysis, probability, statistics, learning theory, mathematical physics and other related fields. Articles using the theory of reproducing kernel spaces are in particular welcomed. CAOT is organised in the following six sections, which are published in the form of “topical collections”: Higher Dimensional Geometric Function Theory and Hypercomplex Analysis Infinite-dimensional Analysis and Non-commutative Theory Linear Operators and Linear Systems Operator Theory and Harmonic Analysis Reproducing Kernel Spaces and Applications Spectral Theory and Operators in Mathematical Physics Accepted papers will be published in the most appropriate section. Bibliographic DataComplex Anal. Oper. TheoryFirst published in 20071 volume per year, 8 issues per volumeapprox. 2600 pages per volumeFormat: 15.5 x 23.5 cmISSN 1661-8254 (print)ISSN 1661-8262 (electronic)AMS Mathematical Citation Quotient (MCQ): 0.59 (2023)
From the journal's Aims & Scope
Research area (LetPub): Mathematics
Editor-in-chief Daniel AlpayPublisher website
Editorial board by country: 1 in mainland China (about 1%); most named United States 22, Germany 9, Israel 8, Italy 6, Austria 5 (86 members with a country) Editorial board ↗Publisher website ·
Main research topics OpenAlex counts of recent articles; shares are approximate
- Holomorphic and Operator TheoryMathematics21%
- Algebraic and Geometric AnalysisMathematics12.6%
- Spectral Theory in Mathematical PhysicsMathematics8.3%
- Mathematical Analysis and Transform MethodsMathematics6.8%
- Advanced Topics in AlgebraMathematics5.2%
- Advanced Harmonic Analysis ResearchMathematics5%
- Analytic and geometric function theoryMathematics5%
- Matrix Theory and AlgorithmsComputer Science4.8%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Mathematics Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 4 |
| Minor | Mathematics | Zone 4 |
| Minor | Mathematics, Applied | Zone 4 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Mathematics Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 3 |
| Minor | Mathematics, Applied | Zone 3 |
| Minor | Mathematics | Zone 3 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Mathematics Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Mathematics | Zone 4 |
| Minor | Mathematics | Zone 4 |
| Minor | Mathematics, Applied | Zone 4 |
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
- 0.99LetPub ·
- Impact factor (publisher) 2025
- 1Publisher website ·
- 5-year impact factor (publisher) 2025
- 0.9Publisher website ·
- CiteScore 2026-06
- 1.3LetPub ·
- SJR 2026-06
- 0.52LetPub ·
- SNIP 2026-06
- 1.03LetPub ·
- h-index
- 17LetPub ·
- h-index
- 34OpenAlex ·
- i10-index
- 375OpenAlex ·
- 2-year mean citedness
- 1.16OpenAlex ·
- Self-citation rate
- 10%LetPub ·
- Share of gold OA articles
- 17.24%LetPub ·
Volume
- Articles per year
- 242LetPub ·
- Downloads per year (publisher) 2025
- 155,300Publisher website ·
Articles by year OpenAlex count · 2,116 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 152 | 55 | 21 |
| 2025 | 244 | 46 | 312 |
| 2024 | 187 | 50 | 345 |
| 2023 | 134 | 36 | 383 |
| 2022 | 127 | 30 | 410 |
| 2021 | 124 | 54 | 504 |
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
117 daysMedian, submission to acceptance · P25–P75 48 days – 191 days
- Acceptance to online
- median 14 days (102 articles)
- Submission to online
- median 130 days
- Sample
- 102 articles with submission and acceptance dates (435 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 3 monthsLetPub ·
- Average acceptance (community reports)
- 50%LetPub ·
- Submission to first decision
- 9 daysPublisher 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 3,090 / EUR 2,490 / GBP 2,190 | — | — |
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)
Open calls for papers1, by deadline
Publisher websiteWhat to prepare4 items from the author guidelines
- Abstract
- 150–250 words
- Keywords
- ≥ 4
- Reference style
- Numbered, in order of citation
- Suggested reviewers
- Optional
Policy excerpts from the journal's websiteAI use, Authorship, Conflicts of interest, Data availability, Publication ethics, License & copyright, Open access, Peer review
- AI use Generative AI Images
LLMs do not satisfy authorship criteria; AI-assisted copy editing need not be declared Model summary
Please check Springer’s policy on generative AI images and make sure your work adheres to the principles described therein. Back to top
Source ↗Publisher website ·- Authorship Authorship principles
These guidelines describe authorship principles and good authorship practices to which prospective authors should adhere to. Authorship clarified The Journal and Publisher assume all authors agreed with the content and that all gave explicit consent to submit and that they obtained consent from the responsible authorities at the institute/organization where the work has been carried out, before th…
Source ↗Publisher website ·- Conflicts of interest Competing Interests
Competing interests disclosure required Model summary
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
Data availability statement required Model summary
All original articles must include a data availability statement. Data availability statements should include information on where data supporting the results reported in the article can be found, if applicable. Statements should include, where applicable, hyperlinks to publicly archived datasets analysed or generated during the study. For the purposes of the data availability statement, “data” is…
Source ↗Publisher website ·- Publication ethics
COPE member, follows COPE guidelines Model summary
This journal is committed to upholding the integrity of the scientific record. As a member of the Committee on Publication Ethics (COPE) the journal will follow the COPE guidelines on how to deal with potential acts of misconduct.
Source ↗Publisher website ·- License & copyright Copyright
Open Choice articles do not require transfer of copyright as the copyright remains with the author. In opting for open access, the author(s) agree to publish the article under a Creative Commons license. Details of the OA licences offered to authors can be found on the individual journal website, in the journal's How to publish with us guide. Back to top
Source ↗Publisher website ·- Open access Open access publishing
To find out more about publishing your work Open Access in Complex Analysis and Operator Theory, including information on fees, funding and licences, visit our Open access publishing page. Back to top
Source ↗Publisher website ·- Peer review
Authors may suggest or exclude reviewers 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
- Quarterly
- Founded
- 2007
- ISSN
- 1661-8254
- Electronic ISSN
- 1661-8262
- Official links
- Journal homepage ↗OpenAlex
- Submission system ↗LetPub
- Author guidelines ↗LetPub
- Special issues ↗Publisher website
FAQ
Frequently asked questions about Complex Analysis and Operator Theory
What CAS zone is Complex Analysis and Operator Theory in?
In the 2025 upgraded edition of the CAS Journal Ranking, Complex Analysis and Operator Theory is in Zone 4 of Mathematics, and in Zone 4 of the minor category Mathematics / Mathematics, Applied. 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 Complex Analysis and Operator Theory?
The latest impact factor listed by LetPub is 0.99; CiteScore 1.3, h-index 34.
How long does peer review take at Complex Analysis and Operator Theory?
Based on the dates recorded on 102 articles published between October 2024 and October 2026 (the last 24 months), the median time from submission to acceptance is 117 days (interquartile range 48–191 days); authors report an average review time of about 3 months; the community-reported acceptance is “about 50%”. 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 Complex Analysis and Operator Theory?
According to the journal's author guidelines: Abstract: 150–250 words; Keywords: ≥ 4; Reference style: Numbered, in order of citation; 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 Complex Analysis and Operator Theory based?
Of the 86 board members whose country the journal's board page names, 1 (about 1%) are in mainland China; the countries named most often are United States (22), Germany (9) and Israel (8). Counted from the institutions listed on the board page; for reference only.
Which databases index Complex Analysis and Operator Theory?
According to LetPub and DOAJ records, Complex Analysis 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 Complex Analysis and Operator Theory open access, and what is the APC?
Complex Analysis and Operator Theory is a hybrid journal. For open-access publication: APC about USD 3,090.
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: .