New page: Constructing truth tables – Filling in the wff's
I wrote a small guide about how to use truth tables to evaluate wff's. I explained two methods to do this. Page: Constructing truth tables - Filling in the wff's…
The current king of France, propositions, sentences, and missing subjects
Consider this set of propositions: P1. The sentence “The current king of France is bald.” expresses a proposition. P2. The sentence “The current king of France is not bald.” expresses…
Language, the modal fallacy and the symbolic representation of a conditional
"[W]hat follows from a true premiss must be true" (The Problems of Philosophy, p. 60, link) Wrote Russell as an example of a principle of logic that is more self-evident…
The Present Progressive and “to see” etc.
In Longman's texts Talking about the present, and Talking about the Past it is claimed that some verbs cannot be used in the present and past progressive. But they can.…
The Present Progressive and time
What is the present progressive? It is a sentence form. Longman Dictionary of Comtemporary English explains it like this: “You make the present progressive by using a form of the…
Moron of the day: Jacqui Dean
Wikipedia on Jacqui Dean. "Jacqueline Isobel (Jacqui) Dean (born 13 May 1957 in Palmerston North) is a New Zealand politician and the current Member of Parliament for the Waitaki electorate."…
Quote: Bertrand Russell, Problems of Philosophy
Wikipedia om bogen. "This seems plainly absurd; but whoever wishes to become a philosopher must learn not to be frightened by absurdities." p. 10. Download: Bertrand Russell - The Problems…
Using propositions as variables
I have encountered the following problem a couple of times. This problem is this: When formalizing something in predicate logic, the predicate uses propositions as variables.1 We may refer to…
Explicating epistemic possibility
It is clear that when we use the phrase “It is possible that...” it is not in all cases used to express mere alethic possibility, that is, “It is logically…
Book review: Possible Worlds, Norman Swartz, Raymond Bradley, 1979
I could write a long detailed review but it is entirely unneeded. This book is without doubt the most enlightening book that I have ever read about logic, and it…
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