Wiarda, G. Integral Equations (Integral'nye uravneniya), 1933. In Russian

Виарда Г. Интегральные уравнения. / Пер. с нем. Д. А. Райкова.
Москва — Ленинград : Государственное технико-теоретическое издательство (ГТТИ), 1933.
192 с. Мягкая издательская обложка, обычный формат. Тираж 5000 экз.
***
Wiarda, G. Integral Equations (Integral'nye uravneniya). / Translated from German by D. A. Raikov.
Moscow — Leningrad: State Technical-Theoretical Publishing House (GTTI), 1933.
192 pp. Paperback, standard format. Print run: 5,000 copies.

This 1933 edition is a significant artifact from the era of rapid mathematical formalization in the Soviet Union. Authored by the German mathematician Georg Jakob Wiarda (1889–1971), this work was translated during a period of intense intellectual exchange between the German and Soviet schools of mathematics. Wiarda, a specialist in potential theory and a doctorate recipient from the University of Marburg, was known for his ability to synthesize complex analytical methods into structured, pedagogical texts.
The book focuses on the theory and application of integral equations, a branch of analysis that became indispensable for solving boundary value problems in physics and engineering. Wiarda provides a rigorous introduction to Fredholm and Volterra equations, exploring their kernels, eigenvalues, and solutions using successive approximations. Given the author's background, the text places a particular emphasis on equations of the first kind and their relationship to potential theory—the mathematical study of fields like gravity and electromagnetism.
The Russian translation was handled by Dmitry Raikov, who would later become a prominent figure in functional analysis (known for the Gelfand-Raikov theorem). This ensures that the mathematical terminology and conceptual flow are of the highest caliber, aligned with the rigorous standards of the 1930s Soviet mathematical tradition.
Physically, the book is a typical product of GTTI (the predecessor to Fizmatgiz), printed in a modest paperback format with a print run of 5,000 copies. As many such technical manuals from the early 1930s were heavily used and later discarded or worn out, surviving copies are increasingly difficult to find.
For mathematicians, historians of science, and collectors of early Soviet technical imprints, this volume is a valuable testament to the foundation of modern mathematical physics and the global nature of scientific knowledge prior to the mid-century's geopolitical shifts.