My logic text, A Concise Introduction to Logic, is available for free online or cheaply from booksellers.
Here’s the digital version, which can be read online, or downloaded as an ebook or as a pdf:
Here’s a link to purchase the book at Amazon:
Here’s a link to a proof-checking software that uses the propositional logic of the text as a guide (the proof checker uses different proof techniques for the first order logic):
I will be posting here soon links to videos meant to help with some of the classes, starting with PHL111 Valid Reasoning. For now, here are some rough drafts of some first videos for introduction to logic:
1.2 A brief clarification about generalities
3.1 Arguments, Valid, and Sound
AdviceA note about philosophy paper format (for DeLancey classes)
Philosophy paper rubric (for DeLancey classes)
What Can I Do With a Philosophy Degree?