Lower Sum
LowerSum
For a given function f(x) over a partition of a given interval, the lower sum is the sum of box areas m^*Deltax_k using the infimum m of the function f(x) in each subinterval [x_(k-1),x_k].
See also
Lower Integral, Riemann Integral, Upper SumExplore with Wolfram|Alpha
WolframAlpha
More things to try:
Cite this as:
Weisstein, Eric W. "Lower Sum." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/LowerSum.html