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ExampleConstruction: Literature-sourcedVerification: AI-generatedSession-authored (Fable 5 assisted)precheck passaudited 2026-08-11
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  • Literature-sourced: the exact statement appears in a cited source; only wording and notation differ.
  • AI-adapted: a semantically identical restatement of literature-sourced material, modulo indexing, notation, and boundary cases adopted by the library.
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01xd(x2)=2/3\int_0^1 x\,d(x^2)=2/3

Example

The reduction for a differentiable integrator gives 01xd(x2)=23.\int_0^1x\,d(x^2)=\frac23.

Facts & Assumptions

Given: f(x)=xf(x)=x and α(x)=x2\alpha(x)=x^2 on [0,1][0,1].

[L1]

A C1C^1 integrator satisfies fdα=fα\int f\,d\alpha=\int f\alpha' (A continuously differentiable integrator reduces Stieltjes integration to ordinary integration).

Verification

technique · computation
1.1

Directly from the difference quotient, [given] (x+h)2x2h=2x+h2x,\frac{(x+h)^2-x^2}{h}=2x+h\longrightarrow2x, so α(x)=2x\alpha'(x)=2x. Likewise, (2x3/3)=2x2(2x^3/3)'=2x^2 by expanding the difference quotient.

1.2

Therefore [L1] and [L2] give [L1, L2] 01xd(x2)=012x2dx=[2x33]01=23.\int_0^1x\,d(x^2)=\int_0^1 2x^2\,dx=\left[\frac{2x^3}{3}\right]_0^1=\frac23.

Depends on

Used by

Nothing in the library uses this result yet.

Dependency tree · next 3 levels

Direct dependencies and their dependencies through the next three levels: 107 results over 17 levels. An arrow runs from a result to what uses it, and this result sits at the bottom with a heavier outline. Click the chart to enlarge it.

Sources