The speaker introduces Sigma Notation, explaining its origin as the Greek capital 'S' and its symbol. Through two examples, they demonstrate how to interpret and calculate the sum represented by Sigma Notation, starting from a given 'k' value and summing up to a specified upper limit. The speaker emphasizes that Sigma Notation is a compact way to represent sums and is often linked to Arithmetic and Geometric Series questions in IB Maths, where it can sometimes confuse students who don't recognize the notation as a request for a sum of terms.
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