A Study of Some General Integrals that Contains the Wide Denjoy Integral
2001
In this paper, using Thomson's local systems, we introduce some very general
integrals, each containing the wide Denjoy integral: the $[{\mathcal S}_1
{\mathcal S}_2 {\mathcal D}]$-integral (of Lusin type); the $[{\mathcal S}_1
{\mathcal S}_2 {\mathcal V}]$-integral (of variational type); the $[{\mathcal
S}_1 {\mathcal S}_2 {\mathcal W}]$-integral (of Ward type); the $[{\mathcal S}_1
{\mathcal S}_2 {\mathcal R}]$-integral (of \linebreak Riemann type); We prove
that in certain conditions the integrals $[{\mathcal S}_1 \!{\mathcal S}_2
{\mathcal V}]$ and $[{\mathcal S}_1 {\mathcal S}_2 {\mathcal W}]$ are equivalent
(it is shown that the first integral satisfies a Saks-Henstock type lemma). For
the $[{\mathcal S}_1{\mathcal S}_2{\mathcal R}]$-integral we only show that it
satisfies a quasi Saks Henstock type lemma (see Lemma 7.4). Finally, if
${\mathcal S}_1 = {\mathcal S}_o^+$ and ${\mathcal S}_2 = {\mathcal S}_o^-$ we
obtain that the integrals $[{\mathcal S}_o^+ {\mathcal S}_o^- {\mathcal V}]$,
$[{\mathcal S}_o^+ {\mathcal S}_o^- {\mathcal W}]$ and $[{\mathcal S}_o^+
{\mathcal S}_o^- {\mathcal D}]$ are equivalent (in fact the $[{\mathcal S}_o^+
{\mathcal S}_o^- {\mathcal D}]$-integral is exactly the wide Denjoy integral).
But the equivalence of the three integrals with the $[{\mathcal S}_o^+ {\mathcal
S}_o^- {\mathcal R}]$-integral follows only if we assume the additional
condition that the primitives of the $[{\mathcal S}_o^+{\mathcal S}_o^-
{\mathcal R}]$-integral are continuous (see Theorem11.1).
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