Other
R. B. Jones: The Philosophy of Logic
Excellent overview of logic. Defines the term in informative detail, while relating logic to its neighbors in epistemology, metaphysics, and analytic philosophy. A terrific introduction to the subject.
Stanford University
Many Valued Logic/stanford Encyclopedia of Philosophy
Explains the logical theory of "many-valued logic," a modern alternative to classic logic. Sections address its history, notation and proofs, and applications to linguistics, mathematics, philosophy, and artificial intelligence. For the...
Stanford University
Stanford Ency. Of Philosophy: Paraconsistent Logic
This site from the Stanford Encyclopedia of Philosophy discusses the logical theory of true contradictions, known as paraconsistent logic. Article addresses the history of the theory's development and a technical presentation of its...
Stanford University
Stanford Encyclopedia of Philosophy: Dialetheism
Describes the notion of "dialetheism," the logical theory of true contradictions. Explains its history of development, its philosophical consequences, and its significance for rationality. Excellent bibliography.
University of Cambridge
University of Cambridge: Nrich: Elf Suits
Reasoning will help you figure out the various combinations of elf suits at this one page website. Check your solution against the solution given and see if they agree with you!