Lothar Collatz passed his first mathematics university exam in Berlin in 1933 supervised by Richard von Mises, who founded Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM) in 1921. Since his graduation L. Collatz published short contributions [1-3] in ZAMM that summarized his presentations from the annual GAMM conferences. His first regular article appeared in ZAMM in 1935, right after the completion of his PhD [4]. In his long career (from obtaining his habilitation in 1937 in Karlsruhe, being a researcher in Karlsruhe and Darmstadt until 1943, when he received a professorship in Hannover and then from 1952 in Hamburg until his retirement 1978) he continuously published in ZAMM contributing over 35 articles.

Lothar Collatz (1910–1990, photography by Elfriede Liebenow)

His work had a major impact on the development of numerical mathematics, particularly by his supervision of 42 PhD students and his involvement in 24 habilitation procedures. Before he moved to Hamburg, all his positions were at Technical Universities. His research is closely related to applications of numerical mathematics in mechanics. Many of his contributions to ZAMM are directly motivated by specific computational engineering challenges for membranes, plates, and bars [2, 5-8] at a time well before the development of modern computers. His engagement for the collaboration of applied mathematics and mechanics was continuously embedded in his activities in GAMM: he was involved in both the organization and management of the GAMM society, especially as President from 1964 to 1966 [9]. With this issue's special anniversary article “Error bounds and enclosures: The development of numerical analysis and the impact of the contributions by Lothar Collatz” we celebrate and remember his work.

Lothar Collat​​z于1933年在理查德·冯·米塞斯（Richard von Mises）的指导下通过了他的第一次数学大学考试，理查德·冯·米塞斯（Richard von Mises ）于1921年创立了ZeitschriftfürAngewandte数学和机械学院（ZAMM）。自毕业以来，L。Collat​​z在ZAMM发表了简短的论文[ 1-3 ] ，总结了该论文。他在年度GAMM会议上的演讲。他的博士学位完成后，他的第一篇常规文章于1935年在ZAMM发表[ 4]。在他漫长的职业生涯中（从1937年在卡尔斯鲁厄（Karlsruhe）获得适应能力，在卡尔斯鲁厄（Karlsruhe）和达姆施塔特（Darmstadt）担任研究员直到1943年（他在汉诺威获得教授职位，然后从1952年在汉堡任职直至1978年退休）），他在ZAMM上连续发表论文超过35文章。

Lothar Collat​​z（1910–1990，Elfriede Liebenow摄影）

他的工作对数字数学的发展产生了重大影响，尤其是他对42名博士生的监督以及他参与了24种适应训练程序。在他移居汉堡之前，他的所有职位都在技术大学中。他的研究与数值数学在力学中的应用密切相关。他对ZAMM所做的许多贡献直接源于对膜，板和条的特定计算工程挑战[ 2、5-8 ]，而这要远远早于现代计算机的发展。他致力于应用数学和力学的合作一直被嵌入GAMM的活动中：他参与了GAMM协会的组织和管理，特别是1964年至1966年担任总统[9 ]。在本期特别周年纪念文章“误差界限和包围圈：数值分析的发展以及Lothar Collat​​z的贡献的影响”中，我们庆祝并记住了他的工作。