Skip to main content
Speakpigeon's user avatar
Speakpigeon's user avatar
Speakpigeon's user avatar
Speakpigeon
  • Member for 6 years, 1 month
  • Last seen this week
  • Paris, France, EU
14 votes
7 answers
7k views

Is there a name for the fallacy whereby the other party to the debate only suggests, does not articulate, what their point is?

10 votes
7 answers
3k views

What did Russell mean when he wrote that the null-class, the class having no members, did not exist?

6 votes
8 answers
3k views

Infinite past with a beginning?

6 votes
2 answers
458 views

Who coined the use of the word "entailment" in the logical sense?

5 votes
3 answers
2k views

What did Bertrand Russell mean exactly when he said that *such that*, while fundamental both to formal logic and to mathematics, is "undefinable"?

5 votes
4 answers
466 views

What characteristics define something as a mathematical entity?

5 votes
1 answer
214 views

What are the main interpretations offered so far of biscuit conditionals?

4 votes
3 answers
178 views

What is wrong with this sort of proof?

4 votes
5 answers
429 views

Where is the fallacy in Seth Yalcin's counterexample to the modus tollens?

4 votes
1 answer
296 views

What were the historical interpretations of Aristotle's definition of validity/logical consequence?

3 votes
0 answers
381 views

Which rational thinkers (theologians, philosophers, scientists, mathematicians etc.), prior to 1850, disagreed with Aristotle's logic?

3 votes
1 answer
133 views

What are the arguments of philosophers against the reasoning which justifies the horseshoe from truth-functionality?

3 votes
6 answers
1k views

Who ever argued that natural languages have an exact logic?

3 votes
3 answers
132 views

What is the logic of the coordinating conjunction BUT?

3 votes
1 answer
72 views

Which author(s) first talked of Aristotle's syllogistic as a logic of terms?

2 votes
0 answers
132 views

Why not just give up on the idea of truth-functionality?

2 votes
1 answer
58 views

All syllogism is addressed to that within the soul: Did Aristotle really said that?

2 votes
0 answers
45 views

Any consensus on Łukasiewicz' idea that Aristotle's syllogisms were systematically misrepresented in the academic literature?

2 votes
0 answers
47 views

What did Bradley mean that it "may be true" that all trespassers will be prosecuted?

2 votes
6 answers
1k views

Is it true that no philosopher disagrees that everything exists?

2 votes
4 answers
246 views

At what point in the history of mathematics, and why, did mathematicians come to say "A implies B" to mean "not A or B"?

2 votes
3 answers
230 views

Which paradoxes are regarded as logical paradoxes?

2 votes
1 answer
103 views

Does a definite description such as "the train" or "the student" always signal uniqueness of the referent?

2 votes
2 answers
110 views

Which logicians before the 19th century adopted the logical operation ¬P ∨ Q as best model of the truth conditions of the conditional?

2 votes
3 answers
565 views

Any concrete, real life example of Peirce's Law? [closed]

1 vote
2 answers
238 views

Is Norman Megill's view of Gödel's incompleteness theorem compatible with what philosophers have said about it?

1 vote
4 answers
437 views

What is a convincing explanation of how Russell's "golden mountains" argument is logically fallacious?

1 vote
1 answer
121 views

Did Aristotle used the term *contradiction* or the term *contradictory* in his discussions of *reductio ad impossibile*?

1 vote
3 answers
206 views

Modal validity & vagueness

1 vote
2 answers
159 views

Justification of existing methods of formal logic [duplicate]