Linked from
The 21 pages that link to Riemann integral, each with the reason it gives.
Limit of a functionRelated: Its construction uses limits of approximating sums.
AreaRelated: Approximating a region with thin rectangles leads to integral-based area calculation.
Function of a real variableRelated: It aggregates a function’s values across an interval.
Standard part functionRelated: Standard parts of hyperfinite sums can recover Riemann integrals.