The variation of a function which exhibits slope changes, also called the saltus of a function. A series may also oscillate, causing it not to converge.
Oscillation
See also
Oscillating Function, SlopeExplore with Wolfram|Alpha
References
Jeffreys, H. and Jeffreys, B. S. "Bounded, Unbounded, Convergent, Oscillatory." §1.041 in Methods of Mathematical Physics, 3rd ed. Cambridge, England: Cambridge University Press, pp. 11-12 and 22, 1988.Referenced on Wolfram|Alpha
OscillationCite this as:
Weisstein, Eric W. "Oscillation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Oscillation.html