Abramowitz and Stegun

Abramowitz and Stegun are two mathematicians who wrote a famous book called the "Handbook of Mathematical Functions". This book is full of equations and formulas that can help explain how things work in the world around us. For example, equations in the book can help us figure out how far a baseball will travel if we throw it, or how many hours of sunlight we will get in one day. The equations in the book are used by scientists, engineers, and mathematicians all over the world to help solve problems and understand the world better.