**What is logic?** Simply put, logic is about what is true and false, and how to reason about things. Informally, logic is also about “what is right and wrong” in a very machine-like manner. Logic can also be used to improve the way you think about learning.

**To me, logic is more basic than mathematics.** At its core, logic is about reasoning, both good and bad. For example, saying “anything is true” is ridiculous, because you can come with phrases such as “water is wet *and* water is not wet *and* water does not exist” which is obviously not true.

But can you,Â *right now*, reason and put forth *why* a statement *does not* make sense? Many people have trouble putting this “*why*” into words. Understanding logic, perhaps, will also make you able to understand *why* something is right and wrong according to some basic rules that *you* define. So, learning logic will make you better at checking yourself and your own logic.

I call this book “casual logic” because it is meant for “casuals” or people who are not dedicated to studying logic already. Many people don’t have enough time to slog through a book that assumes you know algebra. I expect readers to be at “ground zero.” Hopefully this book can turn you into somebody better than before.

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