Jens Lemanski
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View article: A CL System for Propositions and Classes
A CL System for Propositions and Classes Open
Over the past few years, CL diagrams have gained popularity in diagrammatic reasoning, drawing inspiration from Lange’s C ubus L ogicus. The intuitive understanding of CL diagrams is based on simple structures that are straightforward both…
View article: The role of gestures in logic
The role of gestures in logic Open
Gestures are usually regarded as a casual element of communication processes between logicians. By contrast, we aim to show that gestures have played a significant role in logic. We argue that the development of communication techniques an…
View article: Why logic has not taken a step forward or backwards
Why logic has not taken a step forward or backwards Open
The criticism of Immanuel Kant’s logic commenced with the advent of the so-called ‘new logic’ in the 20th century. One particular passage from the second preface to the Critique of Pure Reason has been a source of contention, where Kant as…
View article: Transcendental philosophy and logic diagrams
Transcendental philosophy and logic diagrams Open
Logic diagrams have seen a resurgence in their application in a range of fields, including logic, biology, media science, computer science and philosophy. Consequently, understanding the history and philosophy of these diagrams has become …
View article: Individuals, Existence, and Existential Commitment in Visual Reasoning
Individuals, Existence, and Existential Commitment in Visual Reasoning Open
This article examines the evolution of the concept of existence in modern visual representation and reasoning, highlighting important milestones. In the late eighteenth century, during the so-called golden age of visual reasoning, nominali…
View article: Does Logic Have a History at All?
Does Logic Have a History at All? Open
To believe that logic has no history might at first seem peculiar today. But since the early 20th century, this position has been repeatedly conflated with logical monism of Kantian provenance. This logical monism asserts that only one log…
View article: Kant’s Crucial Contribution to Euler Diagrams
Kant’s Crucial Contribution to Euler Diagrams Open
Logic diagrams have been increasingly studied and applied for a few decades, not only in logic, but also in many other fields of science. The history of logic diagrams is an important subject, as many current systems and applications of lo…
View article: Fichte’s formal logic
Fichte’s formal logic Open
Fichte’s Foundations of the Entire Wissenschaftslehre 1794 is one of the most fundamental books in classical German philosophy. The use of laws of thought to establish foundational principles of transcendental philosophy was groundbreaking…
View article: Analyzing the philosophy of travel with Schopenhauerian argument maps
Analyzing the philosophy of travel with Schopenhauerian argument maps Open
Emily Thomas's seminal book The Meaning of Travel has brought the philosophy of travel back into the public eye in recent years. Thomas has shown that the topic of travel can be approached from numerous different perspectives, ranging from…
View article: On the Origin of Venn Diagrams
On the Origin of Venn Diagrams Open
In this paper we argue that there were several currents, ideas and problems in 19th-century logic that motivated John Venn to develop his famous logic diagrams. To this end, we first examine the problem of uncertainty or over-specification…
View article: Logic Diagrams as Argument Maps in Eristic Dialectics
Logic Diagrams as Argument Maps in Eristic Dialectics Open
This paper analyses a hitherto unknown technique of using logic diagrams to create argument maps in eristic dialectics. The method was invented in the 1810s and -20s by Arthur Schopenhauer, who is considered the originator of modern eristi…
View article: Can Non-Causal Explanations Answer the Leibniz Question?
Can Non-Causal Explanations Answer the Leibniz Question? Open
Leibniz is often cited as an authority when it comes to the formulation and answer strategy of the question “Why is there something rather than nothing?” Yet much current research assumes that Leibniz advocates an unambiguous question and …
View article: Reism, Concretism and Schopenhauer Diagrams
Reism, Concretism and Schopenhauer Diagrams Open
Reism or concretism are the labels for a position in ontology and semantics that is represented by various philosophers. As Kazimierz Ajdukiewicz and Jan Woleński have shown, there are two dimensions with which the abstract expression of r…
View article: Post-Truth as a Procrastination of Enlightenment
Post-Truth as a Procrastination of Enlightenment Open
In recent years the cultural pessimistic position has become known, according to which we live in an “age of post-truth.” This thesis is supported by the observation of an increasing use of argumenta ad passiones in politics. In contrast t…
View article: Periods in the Use of Euler-Type Diagrams
Periods in the Use of Euler-Type Diagrams Open
Logicians commonly speak in a relatively undifferentiated way about pre-Euler diagrams. The thesis of this paper, however, is that there were three periods in the early modern era in which Euler-type diagrams (line diagrams as well as circ…
View article: Means or end? On the Valuation of Logic Diagrams
Means or end? On the Valuation of Logic Diagrams Open
From the beginning of the 16th century to the end of the 18th century, there were not less than ten philosophers who focused extensively on Venn’s ostensible analytical diagrams, as noted by modern historians of logic (Venn, Gardner, Baron…