his paper, published as an editorial in the Journal for Participation and Employee Ownership collects together extensive quotations and extracts from 19th and 20th century thinkers who were little-known for being supporters of workplace democracy.

## Abstraction in Math and Indefiniteness in QM

The paper is published as: Ellerman, D. (2021). On Abstraction in Mathematics and Indefiniteness in Quantum Mechanics. Journal of Philosophical Logic. https://doi.org/10.1007/s10992-020-09586-1

## The “Ownership of the Firm” is a Myth (1975)

This paper was originally published in a journal: Ellerman, David. 1975. “The ‘Ownership of the Firm’ Is a Myth.” Administration and Society 7 (1 May): 27–42, and then we immediately reprinted in a collection of essays: Ellerman, David. 1975. “The ‘Ownership of the Firm’ Is a Myth.” In Organizational Democracy : Participation and Self-Management, edited by David Garson and Michael P. Smith. Beverly Hills CA: Sage Publications.

## Towards Abolishing the Renting of Persons

This paper is a write-up of a speech given in 2017 at a centennial ‘celebration’ of the 1917 Russian Revolution at the Haus der Kunst in Munich.

## Conceptual Errors in the Arrow-Debreu Model

The highly mathematical nature of the Arrow-Debreu and other similar models of general equilibrium hide rather than elucidate the nature of equilibrium in a private property market economy where all factors of production may be purchased or rented.

## The Logical Theory of Canonical Maps

The purpose of this paper is to show that the dual notions of elements & distinctions are the basic analytical concepts needed to unpack and analyze morphisms, duality, and universal constructions in the Sets, the category of sets and functions.

## Negation and Implication in Partition Logic

Our purpose in this paper is to explore the notions of negation and implication in that other mathematical logic of partitions.

## Probability Theory with Superposition Events

In finite probability theory, events are subsets S⊆U of the outcome set. Subsets can be represented by 1-dimensional column vectors. By extending the representation of events to two dimensional matrices, we can introduce “superposition events.”

## COVID-19 Aid to Promote Employee Ownership

The premise of this paper is that state aid to distressed companies should beneﬁt not only the current owners but also the employees, who are the ones taking personal risks to continue or restart companies.

## Comments on Universal Basic Income

This is a draft paper called “UBI: A Bad Idea Whose Time has Come?”. The income supplements supplied due to the coronavirus pandemic have put the UBI back on the policy agenda, so it is appropriate to re-examine the idea. Click here to download the paper.