I am taking a metafysics class1 and last lectur’s topic was time travel. That is an issu i sort of like but i dislike the way people discuss it, in general. Ther is a widespred lack of clarity and lack of training in the relevant logics (that is, modal logics: alethic logic and temporal logic). […]

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 the conclusion is impossible. It sounds a bit unusual at first but it is worded that way to prevent confusion about modalities. A more common […]

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 T T Note that the modal operator is placed in the truth table also. It could also be done like this: P Q P→Q T […]

Inspired by reading of David Hume’s Enquiry concerning the principles of Morals (EPM) edited by Tom L. Beauchamp.1 “Hume is often interpreted as arguing that no value judgment–however extreme, obscene, or cruel–is reasonable or unreasonable, just as no value judgment is factual. This interpretation needs careful assessment. A passion is ‘unreasonable’ for Hume not because […]

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 led me to be very careful about my language use when speaking of such things because there are multiple types of possibilities: Logical, epistemic, physical, […]