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| Discrete Algebra |
 Sigma-Notations Arithmetic Progressions Geometric Progressions Binomial Theorem Pascal's Triangle
1 + 2 + ... + n 1² + 2² + ... + n² 1³ + 2³ + ... + n³
Basic Conceptions Constituents of the Induction Principle Model Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 |
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A sum of indexed numbers is usually written by making use of the ∑–notation:
Any letter can be used as the index of summation:
The following simple formulas are useful in algebraic transformations of the expression:
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