The reference book for artificial intelligence is AIMA. The free to read alternative was written by Poole and Mackworth. They are providing the fulltext on their website and also the powerpoint slides are available. The Poole and Mackworth book doesn't know the term “fuzzy set” and is easier to read. In contrast, the AIMA book is outdated, has a dedicated chapter about Fuzzy logic which isn't needed in an introduction about Artificial Intelligence and is only available in the printed version.
- Russell, Stuart J., and Peter Norvig. Artificial intelligence: a modern approach. Malaysia; Pearson Education Limited,, 2016.
- Poole, David L., and Alan K. Mackworth. Artificial Intelligence: foundations of computational agents. Cambridge University Press, 2010. https://artint.info/html/ArtInt.html