Karl Popper

Reflections on the contrast between the titles of Popper’s Objective Knowledge and Polanyi’s Personal Knowledge led Haack to explore how Polanyi’s ideas might be used to correct some of the distortions caused by Popper’s refusal to allow any role in epistemology to the knowing subject, and thus to throw light on such questions as the relations between the knower and the known, between epistemology and psychology and sociology of knowledge, and between subjectivity and objectivity.

This paper examines the liberal society that Popper lauds, that aims to be truly open, and discusses why another, more communitarian kind of society, particularly societies in Africa, may also reflect the quest for intellectual openness that is Popper’s ideal. Moreover, this paper avers reasons why Popper should be comfortable with such a liberal-communitarian mix. The inter-subjectivity in his critical rationalism is a balance of an explicit individualism, and an implicit social element (Afisi, 2016a). Popper is indeed an author of such a balance. For a society to be truly open requires the careful recognition and protection of individual freedom. However, the extent to which individuals are free to perform actions that they desire without external constraints, and the level of their individuality in relation to others when performing such actions, remain a contentious issue between liberals and more communitarian thinkers. Popper’s critical rationalism provides the necessary impetus to this contention through his view of freedom that I contend can best be viewed as carefully balanced, a view which combines individuality with a social element that upholds community values necessary for openness of society. With this combination, Popper’s politics of liberalism provides an effective model of how a truly open society can be achieved. The values inherent to Popper’s liberalism including those concerning intellectual openness, individual freedom, mutual respect, measured self-respect, welfarism, humanitarianism, accountability, critical debates and feedback from the citizens, together concern the conditions for a society to be truly open. There are many competing thoughts as to what openness might be in Popper’s philosophy. The present study of Popper does not presume to address them all. The focus here is specifically on using Popper’s idea of critical rationalism to balance relations between liberal politics of individual rights and freedom, and communitarian politics of the common good, as it relates to situations about how socio-economic and political conditions in Africa societies should be structured. While I contend that Popper’s works in political philosophy focused centrally on Western political tradition, and not about Africa in its strict sense, significant lessons can be distilled from Popper that can offer suggestions on social reforms in Africa. This paper explores Popper’s project of the open society across the plurality and differences of societies, so that his liberal ideas of individual freedom are not undermined, and the progress of the communitarian idea of the common good, that Africa societies are built upon, is also well enhanced. Liberal individualism and community values inherent to communitarianism are both well accommodated within Popper’s critical rationalism.

Notwithstanding Karl Popper’s deep admiration for ancient Greece and his affection for modern Greece, his work has been mostly viewed with caution by Greek scholars who, until relatively recently, often chose to either ignore or downplay it. This stance can be partially attributed to the novel approach of Popper’s critique to Plato which did not fare well with the foundational biases of modern Greek academic tradition and the prevailing intellectual inclinations of Greek scholars in the fields of the methodology of science and political theory. Although this bias has begun to recede during the last decades, there remains a lot to be done to fully integrate Popper’s work into the Greek intellectual and social discourse. Nevertheless, the establishment of the Department of History and Philosophy of Science at Athens University, along with the efforts of academics and public intellectuals, particularly during the Greek financial crisis of the last decade, have played a pivotal role in generating a broader interest in critical rationalism and popularizing Popper’s ideas among a wider audience. This paper examines the evolution of the reception of Popper’s ideas in Greece, both in scholarly circles and in public life, from the time of publication of his seminal work “The Open Society and its Enemies” until today, highlighting the efforts to foster a more comprehensive understanding of his important contributions

Since Critical Rationalism is considered by some more of an attitude or mindset and by others a methodological approach to philosophical thinking and practical problem-solving, its application, or more accurately, its epistemological testing grounds, should be expected to be much more wide-ranging than they have been so far. With the exception of some published anthologies on Critical Rationalism and occasional nods to the legacy of Karl Popper’s falsificationist methodology, relatively few applicaions of a critical rational approach to contemporary theoretical debates in the social sciences have been published. I wish here to critically challenge the (optimistic) Hegelian and by extension the neoliberal view of the progress of American capitalism by reframing it with the Marxian notion of expropriation as applied to enslavement on plantations. The logic of enslavement as a process by which brutal exploitation has been practiced for centuries offers a falsifying test case of the rationality of capitalism and its promise of individual freedom of choice. This essay is an explicit exercise in the potential power of a version of Popperian critical rationalism being applied to the intersection of modern liberalism and capitalism, exploring the imbrication of a critical and rational analysis.

The doctrine that the content of the conclusion of a deductively valid argument is included in the content of its premises, taken jointly, is a familiar one. It has important consequences for the question of what value valid arguments possess, since it indicates the poverty of three traditional answers: that arguments may and should be used as instruments of persuasion, that they may and should be used as instruments of justification; and that they may and should be used to advance knowledge. The truth is, however, that in each of these cases the argument has only a managerial role and, if there is any work done, it is the premises that do it. It will be maintained that this point has little force against the critical rationalist answer, which I shall defend, that the principal purpose of deductive reasoning from an assemblage of premises is the exploration of their content, facilitating their criticism and rejection. That said, the main aim of the present paper is not to promote critical rationalism but to consider some published objections to the doctrine that a statement asserts every statement that is validly deducible from it. The alleged counterexamples to be considered fall roughly into two groups: statements that emerge with time from a rich mathematical or empirical theory, but were originally unformulated and are deducible from the theory only in a non-trivial way (Frederick 2011, 2014; Williamson 2012); and statements, notably disjunctions, that are easily formulated and are deducible from a theory in a trivial way (Schurz & Weingartner 1987; Mura 1990, 2008; Gemes 1994; Yablo 2014). Each of these counterexamples will be evaluated and dismissed.

Modern (theoretical) physics seems to be in deep crisis today as many of its core aspects are not empirically well-confirmed. Heated exchanges among physicists on the scientific status of physical theories with little or, at best, a tenuous connection to possible experimental tests is highly visible in the popular scientific literature. Some physicists (e.g., Carroll 2014, 2019; Ijjas et al., 2017) argue that science must discard empirical testability as one of its defining properties and the highly explanatory theories of present-day physics should be exempted from experimental testing, while others (e.g., Ellis & Silk 2014) spot in these arguments (for softening the testability or falsifiability requirement for modern physics) a dangerous tendency to undermine science. The philosopher of science who naturally draws most attention in these current debates is Karl Popper (1902-1994). His views, however, are often misrepresented in these debates. The prime objective of this paper is to explain how a more enlightened perspective on the ongoing debates can be obtained by a careful scrutiny of the Popperian criterion of falsifiability. As a first step in achieving this objective we will analyze the two major (conceptual) failures on which the current controversies rest. Our next step will be examining the controversial string theory to see whether the criteria of falsifiability is a ‘blunt instrument’ for determining its scientific status.