Truth, Facts and Contradiction - Ep. 4.4: Breaking the Tractatus

Item: Truth, Facts and Contradiction - Ep. 4.4: Breaking the Tractatus
Rating: 4
Author: PostSingularity Institute

by UFBA Philosophy Lectures

Humanities, Social Sciences & Thought Philosophy & Ethics QDHRWestern philosophy from c 1800 QDHR9Analytical philosophy and Logical Positivism

🎙 UFBA Philosophy Lectures 👥 5K 📅 June 26, 2020 ⏱ 12 min 👁 288 📄 expert opinion 🧭 2026-08-17

Available in: English (current) Français

Keywords

Tractatuscontradictionparaconsistencynegative factsWittgenstein

Summary

In this episode, Professor Graham Priest discusses how Wittgenstein’s Tractatus, which posits an ontology of atomic facts and excludes contradictions, could be adjusted to accommodate true contradictions. The conversation begins with Ramsey’s critique of the Tractatus, using examples like a spot that is both red and blue to show that not all contradictions are formal. Priest explains that Wittgenstein’s atomism is problematic because atomic facts are not independent. He suggests that by adopting a paraconsistent logic, such as first-degree entailment, one can allow for both positive and negative facts, thereby making room for contradictions. This would require a different semantics for negation, treating truth and falsity symmetrically. The discussion highlights the flexibility of the Tractarian picture when the underlying logic is changed, and the implications for the nature of facts and truth.

132 words

Critical Evaluation

Value of the Information & Strength of the Argument

The video provides valuable insights into the philosophical implications of paraconsistent logic for the Tractatus. Priest’s argumentation is clear and well-supported, drawing on historical critiques and logical semantics. He effectively demonstrates how changing the logic alters the ontology, making the discussion both rigorous and accessible.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is high, with Priest referencing Wittgenstein’s Tractatus and Ramsey’s critiques. However, no external sources are cited beyond the video description’s playlists. The title accurately reflects the content, which focuses on breaking the Tractatus by exploring contradictions and negative facts.

102 words

Title / Content Match

The title accurately reflects the content, which focuses on breaking the Tractatus by exploring contradictions and negative facts.

Quality & Reliability

8/10

The video features a recognized expert (Graham Priest) discussing philosophical concepts with depth and precision. The content is well-structured and grounded in established philosophical frameworks, though it lacks explicit citations to external sources.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Season's playlist — Playlist of the season's episodes.
All seasons playlist — Playlist of all seasons.

Concurring Sources

Paraconsistent logic — Supports the discussion of paraconsistent logic.

Contribution & Novelties

The video offers a novel perspective on the Tractatus by suggesting that adopting a paraconsistent logic can accommodate contradictions without abandoning the overall framework. It bridges historical philosophy with modern logical developments.

Pour aller plus loin :

Paraconsistent logic — Overview of paraconsistent logics and their motivations.
Graham Priest — Philosopher known for dialetheism and paraconsistent logic.
Tractatus Logico-Philosophicus — Wittgenstein’s influential work.

63 words

Radar Profile

The radar profile shows high scores in quality and reliability, with moderate scores in quantity and technical level, indicating a focused and expert-driven discussion.

Reliability 8/10