# Some notes on $b$-weakly compact operators

## TL;DR

This paper investigates properties of b-weakly compact operators on Banach lattices, establishing conditions for their modulus, and exploring their relationships with Dunford-Pettis and other operator classes.

## Contribution

It introduces new conditions under which the modulus of an operator exists and is b-weakly compact, and characterizes b-weakly compact operators in relation to Dunford-Pettis operators.

## Key findings

- The modulus of a b-weakly compact operator exists under new conditions.
- Every Dunford-Pettis operator from a Banach lattice is b-weakly compact.
- Order bounded operators into KB-spaces have b-weakly compact moduli.

## Abstract

In this paper, we will study some properties of b-weakly compact operators and we will investigate their relationships to some variety of operators on the normed vector lattices. With some new conditions, we show that the modulus of an operator $T$ from Banach lattice $E$ into Dedekind complete Banach lattice $F$ exists and is $b$-weakly operator whenever $T$ is a $b$-weakly compact operator. We show that every Dunford-Pettis operator from a Banach lattice $E$ into a Banach space $X$ is b-weakly compact, and the converse holds whenever $E$ is an $AM$-space or the norm of $E^\prime$ is order continuous and $E$ has the Dunford-Pettis property. We also show that each order bounded operator from a Banach lattice into a $KB$-space admits a $b$-weakly compact modulus.