PROOF 141

Prove.

If the upper and lower sums meet, the function is integrable

On a closed interval.

Definition D1

A partition of [a,b] is a finite set of points a = x₀ < x₁ < … < xₙ = b. Write Δxᵢ = xᵢ − xᵢ₋₁.

Proof.

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