If you are looking for information on Art of Problem Solving (AoPS) Calculus, it is a high-level single-variable calculus curriculum designed for advanced students. While "portable" usually refers to digital formats like PDF, it's important to note how AoPS officially handles digital access versus unofficial "portable" files found online. Official Digital and Portable Options
: The curriculum is certified by the College Board as a rigorous AP Calculus BC Art of Problem Solving 2. Diagnostic & Supplementary PDFs
For the most effective preparation, it is recommended to be "crystal clear" on high school mathematics
Title: Mastering Calculus on the Go: The Portable AoPS Calculus PDF
It is typically used by advanced high school students or college freshmen who already completed AoPS’s precalculus or have strong algebra/trigonometry foundations.