Bruce Crauder & Benny Evans 
Preparation for Calculus [EPUB ebook] 
Functions and How They Change

Luca (University of Parma) Lorenzi & Adbelaziz (University of Salerno) Rhandi: Semigroups of Bounded Operators and Second-Order Elliptic and Parabolic Partial Differential Equations

Yi (Industry 4.0 Artificial Intelligence Laboratory, Dongguan University of Technology, China) Chen & Yun (Industry 4.0 Artificial Intelligence Laboratory, Dongguan University of Technology, China; Faculty of Engineering, University of Strathclyde, UK) Li

Abduhamid Dzhuraev: Degenerate and Other Problems

Elsa (University di Torino, Italy) Abbena & Alfred (University of Maryland, College Park, MD) Gray: Modern Differential Geometry of Curves and Surfaces with Mathematica

Gary L. (The Pennsylvania State University, University Park, USA) Mullen & James A. (The Pennsylvania State University, University Park, USA) Sellers: Abstract Algebra

Peter G. Hinman: Fundamentals of Mathematical Logic

D. Yogi (University of South Florida, USA) Goswami & Frank (University of Colorado, Boulder, USA (retired)) Kreith: Energy Efficiency and Renewable Energy Handbook

J.J. Allaire & Garrett Grolemund: R Markdown

Boris V. Gnedenko & Victor Yu. Korolev: Random Summation

Manfred Stoll: Introduction to Real Analysis