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The $L^{r}$ Henstock-Kurzweil integral

100%

Musial P. , Sagher Y.

Studia Mathematica

2004

tom 160

nr 1

53-81

We present a method of integration along the lines of the Henstock-Kurzweil integral. All $L^{r}$-derivatives are integrable in this method.

A geometrical/combinatorical question with implications for the John-Nirenberg inequality for BMO functions

80%

Cwikel M. , Sagher Y. , Shvartsman P.

Banach Center Publications

2011

tom 95

nr 1

45-53

The first and last sections of this paper are intended for a general mathematical audience. In addition to some very brief remarks of a somewhat historical nature, we pose a rather simply formulated question in the realm of (discrete) geometry. This question has arisen in connection with a recently developed approach for studying various versions of the function space BMO. We describe that approach and the results that it gives. Special cases of one of our results give alternative proofs of the celebrated John-Nirenberg inequality and of related inequalities due to John and to Wik. One of our main results is that an affirmative answer to the above question would lead to a version of the John-Nirenberg inequality with "dimension free" constants.