The present volume of the Journal of Physics: Conference Series represents contributions from participants of the IX International conference Lavrentyev readings on mathematics, mechanics, and physics dedicated to the 120^th anniversary of birth of Academician Mikhail Alekseevich Lavrentyev. The Conference was held at Novosibirsk Akademgorodok, Russia, on September 07–11, 2020, and organized by Lavrentyev Institute of Hydrodynamics and Novosibirsk State University.

The Conference is traditional and attracts attention of mathematicians and physicists. Scientific activities of the Conference include discussion of a wide range of problems: mathematical problems of continuum mechanics, physics and mechanics of high-energy processes, fluid mechanics and mechanics of solids. The program of conference included 12 plenary presentations (40 minutes) and 186 oral presentations (20 minutes) given by more than 170 participants from 38 cities of Russia (Moscow, Saint-Petersburg, Novosibirsk, Vladivostok, Tomsk, Yakutsk, Perm, Novokuznetsk, Biysk, Barnaul, Krasnoyarsk, etc.). A significant part of talks (about 30 %) were presented by young researchers and postgraduate students.

We would like to thank the Speakers for their significant contributions to the conference. We also would like to thank the members of the Organizing Committee. We cannot end without expressing our many thanks to our sponsors (Russian Foundation for Basic Research (grant number 20-01-22014), Novosibirsk State University, Mathematical Center in Akademgorodok (the agreement with Ministry of Science and High Education of the Russian Federation number 075-15-2019-1675) for their financial support.

Novosibirsk, September 2020

Evgeny Ermanyuk

Evgeny Rudoy

Eduard Pruuel

本期物理学杂志：会议系列代表了 IX 国际会议 Lavrentyev 为纪念 Mikhail Alekseevich Lavrentyev 院士诞辰 120 周年而^{阅读的关于数学、力学和物理学的参与者的贡献。}会议于 2020 年 9 月 7 日至 11 日在俄罗斯新西伯利亚学院举行，由拉夫伦季耶夫流体动力学研究所和新西伯利亚国立大学主办。

会议是传统的，吸引了数学家和物理学家的注意。会议的科学活动包括对广泛问题的讨论：连续介质力学的数学问题、高能过程的物理学和力学、流体力学和固体力学。会议议程包括来自俄罗斯 38 个城市（莫斯科、圣彼得堡、新西伯利亚、符拉迪沃斯托克、托木斯克、雅库茨克、彼尔姆、新库兹涅茨克、比斯克、巴尔瑙尔、克拉斯诺亚尔斯克等）。年轻的研究人员和研究生发表了相当一部分的演讲（约 30%）。

我们要感谢发言者对会议的重大贡献。我们还要感谢组委会的成员。最后，我们必须对我们的赞助商（俄罗斯基础研究基金会（资助编号 20-01-22014）、新西伯利亚国立大学、Akademgorodok 数学中心（与俄罗斯联邦科学和高等教育部的协议编号075-15-2019-1675）为他们的财政支持。

新西伯利亚，2020 年 9 月

叶夫根尼·埃尔马纽克

叶夫根尼·鲁多伊

爱德华·普鲁埃尔