Extrema of a Function - Simon Fraser University
https://www.sfu.ca/math-coursenotes/Math%20157%20Course%20Notes/sec_Extrema.html
Web5.5.1 Relative Extrema. ¶. A relative maximum point on a function is a point (x, y) on the graph of the function whose y -coordinate is larger than all other y -coordinates on the graph at points “close to” (x, y). More precisely, (x, f(x)) is a relative maximum if there is an interval (a, b) with a < x < b and f(x) ≥ f(z) for every z in ...
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