Human rationality
Induction and deduction are foundational to human rationality because it is impossible for a human to stop using them. Indeed what it means to be humanly rational is that one…
Book available: The Web of Belief
I found the text on the internet and I have created this fine PDF version. W. V. Quine, J. S. Ullian - The Web of Belief
Valid arguments, contingent truths & forms
n Proposition Symbol Explanation 1 Peter is gay. P1 Premise 2 Peter is male. Q From 1 Valid? Perhaps. A truth table with show: P Q ¬Q P∧¬Q T T…
Complete arguments
A complete argument is as argument that is stated or presented such that: 1. One can see all the propositions in the argument. 2. All the propositions in the argument…
Validity and necessary truths
Validity is defined in a couple of ways. I like to define it like this: An argument is valid iff the superconjunction1 of all the premises and the negation of…
Truth tables and necessary truths
In the essay Validity and necessary truths I used truth tables with necessary truths and impossibilities in it. I did it like this: P □Q P→□Q T T T F…
Quote of the day: Jake "Leaf" Greenleaf
Concerning a formal debate with a theist: "I'm not telling the theist how to affirm, I'm saying how to present it. A numbered list of premises, inferences and a conclusion…
Logical impossibilities
What does impossible mean? Other than 'not-possible'. Logical impossibility is the topic of this essay. More specifically we're going to explore the two distinct meanings of logical impossible that I…
Some modal fallacy whine
Given how much debate the modal fallacy have spawned on FRDB, it's interesting to note how little two academics wrote about it when they encountered it while discussing knowledge skepticism:…
Definition of 'a probability'
A probability is something that is more than a mere logical possibility. I also think that it is stronger than a mere physical possibility (I'm a regularity theorist). Here's one…
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