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…
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:…
Stone-paradox – revised and explained
I posted this text a long time ago in Danish and I translated it and used it on the forum. I think I forgot to post the English version here…
Modal logic formalization, multiple kinds of possibilities
Formatting requires a PDF file. modal-logic-formalization
A journey into possibility land
Intro and types I've been paying very close attention as of late to a special type of discourse: Namely, about what is possible and what is impossible. This study has…
Does a sound LPoE establish that god is impossible?
I've heard that claim, but do you think it is true? I don't. All LPoEs (Logical Problem of Evil's) can be seen as an inconsistent set of propositions. Here's a…
The modal fallacy
This is a translation of my earlier article on the subject. Link. The modal fallacy By Emil Kirkegaard, Deleet.dk This fallacy is rather common among persons who are not well…