《微分方程定性理論電子期刊》(EJQTDE)由T. A. Burton和L. Hatvani于1998年創辦。從那時起，我們得出該期刊的影響因子為0.881(5年影響因子為0.992)。我們感謝我們的作者和編輯的成功。《微分方程定性理論電子期刊》(EJQTDE)致力于為您提供高質量的微分方程定性理論論文。在EJQTDE中出現的論文以PDF格式提供，可以預覽或下載到您的計算機中。EJQTDE由數學評論Zentralblatt和Scopus覆蓋。湯森路透產品和定制信息服務也選擇了它，這意味著它的內容在科學引文索引、當前內容和期刊引文報告中都有索引。我們的期刊有國際標準編號胡士恩1417-3875。所有與微分方程定性理論(穩定性、周期性、有界性等)相關的主題(ODE’s、PDE’s、積分方程、泛函微分方程等)及其應用都將考慮出版。研究論文的評審標準與數學評論所涵蓋的任何印刷期刊的評審標準相同。長篇論文和會議記錄可作為專著接受編輯的自由裁量權。《微分方程定性理論電子期刊》每3-4年出版一次博萊研究所主辦的微分方程定性理論學術研討會論文集。《微分方程定性理論電子期刊》是一本開放獲取的期刊，它意味著所有的內容都是免費提供給用戶或他/她的機構的。未經出版商或作者事先許可，用戶可以閱讀、下載、復制、分發、打印、搜索或鏈接到文章的全文，或將文章用于任何其他合法目的。這符合BOAI對開放獲取的定義。出版也不收取任何費用。

The Electronic Journal of Qualitative Theory of Differential Equations (EJQTDE) was founded by T. A. Burton and L. Hatvani in 1998. Since then we achieved that this journal has an impact factor of 0.881 (5-year impact factor: 0.992). We thank this success to our authors and editors.The Electronic Journal of Qualitative Theory of Differential Equations (EJQTDE) is dedicated to bringing you high quality papers on the qualitative theory of differential equations. Papers appearing in EJQTDE are available in PDF format that can be previewed, or downloaded to your computer. The EJQTDE is covered by the Mathematical Reviews, Zentralblatt and Scopus. It is also selected for coverage in Thomson Reuters products and custom information services, which means that its content is indexed in Science Citation Index, Current Contents and Journal Citation Reports. Our journal has the International Standard Serial Number HU ISSN 1417-3875.All topics related to the qualitative theory (stability, periodicity, boundedness, etc.) of differential equations (ODE's, PDE's, integral equations, functional differential equations, etc.) and their applications will be considered for publication. Research articles are refereed under the same standards as those used by any printed journals covered by the Mathematical Reviews. Long papers and proceedings of conferences are accepted as monographs at the discretion of the editors. The Electronic Journal of Qualitative Theory of Differential Equations will publish the proceedings of the Colloquium of Qualitative Theory of Differential Equations organized by the Bolyai Institute every 3-4 years.The Electronic Journal of Qualitative Theory of Differential Equations is an open access journal which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This is in accordance with the BOAI definition of open access. There are no charges and fees for publication, either.