### 4 videos in "Summations"

## It's all Greek to me. Sigma Notation.

It's all Greek to me. Sigma Notation.

2334 views, 2 ratings - 00:09:50

Part of video series Summations

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Learn about sigma notation, sequences, tetrahedral numbers, pyramidal numbers, and their relationships analytically and geometrically.

- The On-Line Encyclopedia of Integer Sequences - A very useful sequence look-up utility.

- What is sigma notation?
- How do you write sigma notation?
- What is a tetrahedral number?
- What is a pyramidal number?
- Is there a formula for tetrahedral numbers?
- Are there formulas relating tetrahedral numbers and pyramidal numbers?

This video does a great job of explaining how to understand tetrahedral and pyramidal numbers geometrically, how they relate to each other, and how to use sigma notation to represent sequences. This is a very important lesson with a nice resource for learning some fundamentals about sigma notation and types of sequences.