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The digital root (also repeated digital sum) of a natural number in a given radix is the (single digit) value obtained by an iterative process of summing digits, on each iteration using the result from the previous iteration to compute a digit sum. The process continues until a single-digit number is reached.

Microsoft Corporation is an American multinational technology corporation which produces computer software, consumer electronics, personal computers, and related services. Its best-known software products are the Microsoft Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers.

Amazon.com, Inc. Logo since 2000 The Amazon Spheres, part of the Amazon headquarters in Seattle, U.S. Trade name Amazon Formerly Cadabra, Inc. (1994–1995) Type Public Traded as Nasdaq: AMZN Nasdaq-100 component S&P 100 component S&P 500 component ISIN Industry E-commerce Cloud Computing Artificial intelligence Consumer electronics Entertainment Digital distribution Self-driving cars ...

In algebra, which is a broad division of mathematics, abstract algebra (occasionally called modern algebra) is the study of algebraic structures. Algebraic structures include groups, rings, fields, modules, vector spaces, lattices, and algebras. The term abstract algebra was coined in the early 20th century to distinguish this area of study ...