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Linearity, monotonicity, the absolute-value estimate and coordinate-slice additivity for the Riemann integral in
Statement
Let be nondegenerate. For integrable and scalars , the function is integrable and its integral is . If , then . Also is integrable and . If , cutting at the coordinate hyperplane gives two nondegenerate subrectangles; integrability on is equivalent to integrability on both restrictions, and their integral values add to the integral over .
Facts & Assumptions
Given: The stated integrable functions on the nondegenerate rectangle, and, for coordinate-slice additivity, a strictly interior cut .
Small Darboux gaps characterize integrability; a common refinement improves both lower and upper sums; and the common integral is the tagged-mesh limit (Riemann's criterion on a nondegenerate rectangle in : integrability is equivalent to arbitrarily small Darboux gaps, Refinement raises multidimensional lower sums and lowers upper sums, with a quantitative boundary-slab estimate, The multidimensional Darboux and tagged-mesh definitions of the Riemann integral agree).
Grid sums split coordinatewise (Grid partitions of a rectangle in , their cells, refinements and mesh, Laws of finite sums and finite products).
, the reverse triangle inequality on the real line (The reverse triangle inequality, Absolute value in an ordered field, Basic properties of the absolute value).
Proof
Refine grids good for and . Cellwise supremum and infimum estimates make the gap of at most times the gap of plus times that of ; tagged-sum linearity identifies the value.
Termwise gives monotonicity of every tagged sum and hence of integrals. By [L3], the oscillation of on a cell is no larger than that of , so is integrable; then gives the absolute-value estimate.
Insert the cut coordinate into the grid. [L2] splits every Darboux or tagged sum into the two subrectangle sums. Good grids splice conversely, proving integrability on exactly when both restrictions are integrable, and proving additivity.
These arguments establish all clauses with positively oriented rectangles.
Depends on
- The lower and upper Darboux integrals over a nondegenerate rectangle in $\mathbb{R}^m$
- Riemann's criterion on a nondegenerate rectangle in $\mathbb{R}^m$: integrability is equivalent to arbitrarily small Darboux gaps
- The multidimensional Darboux and tagged-mesh definitions of the Riemann integral agree
- Refinement raises multidimensional lower sums and lowers upper sums, with a quantitative boundary-slab estimate
- Lower and upper Darboux sums over a grid partition in $\mathbb{R}^m$
- Grid partitions of a rectangle in $\mathbb{R}^m$, their cells, refinements and mesh
- Laws of finite sums and finite products
- Absolute value in an ordered field
- Basic properties of the absolute value
- The reverse triangle inequality
Used by
- A curl-free field has zero circulation around the induced boundary chain of a C² patch Corollary
- A field with vanishing divergence has zero outward flux through the boundary of a glued elementary solid Corollary
- A nonzero-degree map to a connected manifold is surjective Corollary
- Change of variables on bounded open Jordan sets when both integrands are bounded and Riemann integrable Corollary
- Green's second identity on a glued elementary solid region Corollary
- Jordan content is finitely additive when the overlap has content zero Corollary
- The divergence at a point is the limit of outward flux per unit volume Corollary
- The integral of a product function on a product rectangle is the product of the two integrals Corollary
- The normal component of the curl is the limiting circulation per unit area of shrinking discs Corollary
- The volume of a glued elementary solid is a third of the outward flux of the position field Corollary
- De Rham integration cochain Definition
- Improper multiple integrals and absolute convergence on open sets Definition
- A normalized compactly supported top form on Euclidean space Example
- Principal value distribution one over x Example
- Additivity of the integral over finitely many Jordan pieces that fill a Jordan set up to content zero Lemma
- An integrable dominator gives uniform tail control on every compact parameter set Lemma
- Change of variables for a C¹ map injective and regular only on the interior of a compact Jordan set Lemma
- Changing a bounded integrand on a content-zero set does not change its Riemann integral Lemma
- Compactly supported top cohomology propagates across overlapping oriented coordinate balls Lemma
- Finite chart localization gives choice-free integration and compact Stokes Lemma
- Finite Jordan covers bound upper integrals, while interior-disjoint Jordan subfamilies bound lower integrals Lemma
- Finite sums of product tests are dense on product open sets Lemma
- Shared boundary arcs cancel when finitely many elementary regions are glued Lemma
- Stokes theorem for the standard simplex Lemma
- The plane Gaussian integral equals π by polar coordinates Lemma
- The Riemann integral of a compactly supported function is independent of its bounding rectangle Lemma
- The Riemann integral over a Jordan set is independent of the bounding rectangle Lemma
- Zero-integral compactly supported top forms on Euclidean space have compactly supported primitives Lemma
- Linearity and additivity of the form integral Proposition
- Positivity of the oriented integral Proposition
- Absolute convergence makes signed improper multiple integrals independent of exhaustion Theorem
- Change of variables for an injective C¹ map on a compact Jordan set Theorem
- Comparison and absolute comparison tests for improper multiple integrals Theorem
- Differentiation under an improper multiple integral under an integrable derivative bound Theorem
- Every Jordan exhaustion computes a nonnegative improper multiple integral Theorem
- Locally dominated parameter-dependent improper multiple integrals are continuous Theorem
- Orientation-free density integration and its properties Theorem
- Riemann--Fubini on product rectangles, with lower and upper section integrals and content-zero exceptional sections Theorem
- The cylindrical-shell formula for a solid of revolution about the y-axis Theorem
- The divergence theorem on an elementary solid region Theorem
…and 1 more result.
Dependency tree · two levels
39 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.
Sources
- J. Lebl, Basic Analysis, Riemann Integral in Several Variables (standard reference, not scraped)
- J. Lebl, Basic Analysis, The Riemann-Lebesgue Criterion (standard reference, not scraped)