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A global minimum of a function is the lowest point over its entire domain. It is where the function attains its smallest value.
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Critical Point: A point on the graph where the derivative is zero or undefined; potential location for local extrema.
Local Minimum: The lowest point in a particular region of the graph, but not necessarily over the entire domain.
Derivative: A measure of how a function changes as its input changes; used to find slopes of tangents and identify critical points.