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Understanding Δx: The Meaning and Importance of Uppercase …
Sep 26, 2011. Mean. In summary, the uppercase delta symbol, Δ, represents the difference between two values or the amount of change in a variable. In elementary math, it is often used to find the slope of a line, while in calculus it is used to find instantaneous velocity. The lowercase delta symbol, δ, is used to represent uncertainty or a ...