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Questions tagged [logic]

For questions about logic, whether it concerns syllogistic logic, mathematical logic or the nature of logic itself.

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15answers
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Is the claim “this coin is fair” falsifiable?

Wikipedia says, The claim "No human lives forever" is not falsifiable since one would have to observe a human living forever to falsify that claim. Thinking on similar lines, even if the ...
9
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5answers
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What's an intuition for material implication?

The paradoxes of material implication show that the usual interpretation of implication as "if ... then" statements leads to counter-intuitive results. For example, from (P & Q) -> R we can ...
-1
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2answers
574 views

What is an 'argumentum ad baculum'? [closed]

I've seen philosophical arguments descriped as 'argumentum ad baculum', but never quite understood what the criticism is trying to indicate. As best I can tell, it's using force or the threat of force ...
4
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2answers
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God's paradoxes and their implications [duplicate]

Possible Duplicate: Is the definition of God consistent? As many of you, I've come across a few paradoxes of all sorts, from logic to math, linguistics and so forth. Some of such involve God or, ...
8
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1answer
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What is an 'argumentum ad lapidem'? [closed]

I've seen philosophical arguments descriped as 'argumentum ad lapidem', but never quite understood what the criticism is trying to indicate. As best I can tell, it's a dismissal of an argument with ...
7
votes
2answers
3k views

What is a “straw man” argument? [closed]

What is a "straw man" argument? Assuming an interlocutor is utilizing such an argument against you, what are some techniques for countering it? What motivations might lie behind a disputant using a ...
54
votes
20answers
10k views

Is the “omniscient-omnipotent-omnipresent” definition of God consistent?

God is commonly defined as an omniscient (infinite knowledge), omnipotent (unlimited power), omnipresent (present everywhere) entity. Is there any logical inconsistency in this definition? I have ...
4
votes
2answers
462 views

Is there any possible world in which 2+2=5?

Gödel's incompleteness theorems show that arithmetic is either inconsistent or incomplete, and that arithmetic cannot prove its own consistency. It is useful to believe that arithmetic is consistent, ...
12
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9answers
4k views

When can we call an explanation “rational”?

There are a lot of questions involving rational judgment, rational choice, rational explanation, etc... And at the same time, it seems that "being rational" is a guiding principle for a lot of people. ...
71
votes
8answers
10k views

Is Kurt Gödel's Incompleteness Theorem a “cheap trick”?

I found a throw-away critique of Kurt Gödel's Incompleteness Theorem in an essay about Deconstruction: The basic enterprise of contemporary literary criticism is actually quite simple. It is based on ...
10
votes
2answers
996 views

What's the relevance of falsifiability in regards to logical arguments?

Is it reasonable to classify logical propositions that rely on deduction and are non-falsifiable as being inherently not worthy pursuing or does this just applies to inductive reasoning?
15
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9answers
394 views

Is 'equality' ultimately grounded in empirical observation?

Let's say I invent a concept X in my own imaginings. The only property it has is X-ness; it is defined as 'that which is represented by X'. I have just defined that to be the case. It seems to me, ...
45
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12answers
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Does Pascal's Wager contain any logical flaws or fallacies?

Blaise Pascal's famous wager was that even if the existence of God cannot be determined through reason, a rational person should wager as though God exists, because living life accordingly has ...
61
votes
11answers
13k views

Can you prove anything in philosophy?

I don't understand philosophy very well, and so I am wondering whether you can "prove" anything in philosophy. It always seems you can go a layer down, and find another question, almost endlessly ...
19
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8answers
24k views

What is the difference between “necessary” and “sufficient”?

What is the logical difference between something being necessary in order for something else to be true; as opposed to something being sufficient to make something else true. i.e. Fuel is sufficient ...