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It is the operator used by Gottfried Liebniz, who developed calculus (in parallel with Newton).The "d" denotes a difference and, the full representation, dy/dx (not ddx), is used to represent a change in y divided by (per) a change in x. However, calculus goes further than comparing simple changes but uses these changes for smaller and smaller changes in x, that is, the limit of the change as dx approaches 0.

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βˆ™ 6y ago
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βˆ™ 6y ago

This is often written, for example, as dy/dx. You can think of this as "a tiny change in 'y', divided by a tiny change in 'x'".However, the formal definition is a bit more complicated.

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Q: Why is ddx the derivative operator for Calculus?
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