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Question posted on March 19, 2015; 1 response
I'm still puzzled by the answers to question 5792, on whether it is true that Mary won all the games of chess she played, when Mary never played any game of chess. Both respondents said that it is true....
Language, Logic Show

Question posted on March 19, 2015; no responses
The three laws of logic, which are the law of contradiction (or non-contradiction), the law of excluded middle, and the law of identity are considered absolute, eternal, invariant, and universal. However, there are several alternatives to the three laws of...
Logic Show

Question posted on March 5, 2015; 1 response
Are there any books or videos or blogs or anything easily accessible that provide actual English translations of symbolic logic? If I could just read some straight-up translations it would be far easier for me to learn symbolic logic. I...
Logic Show

Question posted on February 9, 2015; 1 response
So I'm reading The Power of Logic, 4th edition. While on a section describing Modus Tollen it says that, Not A; If A, then B; So, Not B is an example of Modus Tollen. My question is how can that...
Logic Show

Question posted on February 9, 2015; 2 responses
Suppose I have never played a game of chess. If I now make the claim that I've won all the games of chess I've ever played, is that claim true, false, or undefined? A group of friends had...
Language, Logic Show

Question posted on February 9, 2015; 4 responses
On April 10, 2014, in response to a question, Stephen Maitzen wrote: "I can't see how there could be any law more fundamental than the law of non-contradiction (LNC)." I thought that there were entire logical systems developed...
Logic Show

Question posted on December 4, 2014; 1 response
I'm developing a rebuttal to Biblical literalists and I'd like to know whether the following is a recognized/named type of syllogism or other type of argument (and if so, what it's called): Verse X prophesied that would happen ...
Logic, Religion Show

Question posted on October 23, 2014; 1 response
What's the difference between understanding an opponent's argument, and agreeing with it? What prevents me from saying that if my opponent disagrees with my argument, he must misunderstand it?...
Logic Show

Question posted on September 18, 2014; 4 responses
Is it possible for two tautologies to not be logically equivalent?...
Logic Show

Question posted on August 21, 2014; 1 response
Have Zeno's paradoxes of motion actually been satisfactorily solved? Physicists and mathematicians I've read on the matter seem to regard them as no longer important, but never explain convincingly (for my money) why they're not still important. Have philosophers said...
Logic, Space, Time Show

Question posted on August 21, 2014; 1 response
Someone deliberately advances a fallacious argument in an attempt to advance a cause she considers just. For example, she may treat contraries as if they are contradictories and thus commit a fallacy of false alternatives. Are there any living philosophers...
Logic Show

Question posted on August 21, 2014; 1 response
What is the difference between a conclusion that is "necessarily true, but not false" vs. "necessarily false, but not true"? They seem the same to me or is the answer based on probability? In the same light,...
Logic Show

Question posted on May 8, 2014; 10 responses
In paradoxes such as the Epimenides 'liar' example, is it not sufficient to say that all such sentences are inherently contradictory and therefore without meaning? Like Chomsky's 'the green river sleeps furiously', it's a sentence, to be sure, but that's...
Logic Show

Question posted on April 25, 2014; 1 response
Can you define logical validity? I'm engaged in a debate on the subject, with a friend, whom will not easily accept anyones word on the matter, so i would ask that you perhaps post your credentials? thank you for you...
Logic Show

Question posted on April 4, 2014; 1 response
On what grounds are the three classic laws of thought rendered 'true'? Is there a more fundamental law which enables us to see the law of identity, the law of excluded middle and the law of non-contradiction as true? If...
Logic Show

Question posted on April 4, 2014; 1 response
How important is the study of logic in philosophy, independent of any one particular philosopher or school of philosophy? Is 'logic' considered a 'neutral' subject about which 'everyone' agrees? or are there some contentious issues about what 'kind'...
Logic, Philosophy Show

Question posted on March 6, 2014; 1 response
What is the metaphysical nature of logic itself? When we refer to a basic principle of logic (such as non-contradiction) are we referring to something that exists which we call “non-contradiction”? Or is it simply an abstraction that doesn’t exist...
Logic Show

Question posted on March 6, 2014; 1 response
Hello All, My question is if someone makes an argument using conditional statements is the argument necessarily deductive? Basically the person claims because I am using If . . . .then clauses then that makes my argument deductive by default. I...
Logic Show

Question posted on September 25, 2013; 2 responses
It has been said that if there is human freedom, then we are responsible for our actions. By this, it seems natural to suppose that "given that there is no human freedom (let's just suppose for the sake of argument)...
Freedom, Logic Show

Question posted on September 12, 2013; 1 response
Would someone please clarify the importance of the distinction between a) either A is true, or Not A is true and b) either A is true, or A is not true I've seen answers on this site in...
Logic Show




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