The product is a hardcover textbook titled "On Functions and Functional Equations" by J. Smital, published by CRC Press LLC in 1988. The book, with 164 pages, is focused on the subject area of mathematics, specifically covering differential equations, functional analysis, and general functions. The author provides in-depth explanations and insights into functions and functional equations, making it a valuable resource for both students and professionals in the field of mathematics. The book comes with a dust jacket and measures 5.1 inches in length, 7.8 inches in width, and 0.9 inches in height, weighing 9.7 ounces.