1. Conditions are given to ensure the convergence of certain infinite series and recursion algorithms.

Es werden Bedingungen angegeben, unter denen die auftretenden unendlichen Reihen und die diversen Rekursionsverfahren konvergieren.

2. Adding more than two numbers can be viewed as repeated addition; this procedure is known as summation and includes ways to add infinitely many numbers in an infinite series . Repeated addition of the number one is the most basic form of counting .

Die zwei oder mehr Zahlen, die addiert werden, heißen Summanden; das Ergebnis heißt Summe .