An abelian group under addition that is also a semigroup under multiplication. Example: Polynomials or square matrices.
Developed from the study of permutations in the 19th century. 💍 Rings Introductory Modern Algebra: A Historical Approach
The most "number-like" structures where you can add, subtract, multiply, and divide. An abelian group under addition that is also
Boolean algebra forms the logic of all digital circuits. To help you dive deeper, Introductory Modern Algebra: A Historical Approach
