University of South Florida
Educational Technology Clearinghouse: Lit2 Go: Lewis Carroll: Symbolic Logic
The text of a book "discussing the area of mathematics which studies the purely formal properties of strings of symbols." The text can be read online or downloaded by individual chapters in MP3 or PDF format. In addition, each chapter...
CK-12 Foundation
Ck 12: Precalculus Concepts 2.0
A complete high school Precalculus Concepts course. Includes 'Related Modalities' for each lesson that teach the same concept in different ways. The text materials follows Algebra II and comes before Calculus or Statistics. The content...