Final answer:
The code referred to in 'Discrete Mathematics with Applications' by Susanna S. Epp is mathematical notation.
Step-by-step explanation:
The code referred to in the context of the book 'Discrete Mathematics with Applications' by Susanna S. Epp is mathematical notation. In this book, the term code is used to represent symbols or language used in mathematics to express concepts and relationships. It is different from programming code, access code, and encryption code.
For example, in mathematics, we use notation like '+', '-', 'x', '÷' to represent addition, subtraction, multiplication, and division operations. We also use symbols like '<', '>', '≤', '≥' to represent inequalities. These symbols and notations are collectively referred to as mathematical code.
By using mathematical code, mathematicians can express complex mathematical ideas concisely and precisely, making it easier to communicate and analyze mathematical concepts.