..this book is a very good introduction to logic, a fundamental aspect of philosohpy and mathematics. For example, logical propositions are constructed as a so called fraction with the premiss as the "numerator" and the conclusion as the "denominator", and this is explained clearly on page 7 out of 109.
The book condenses a wide range of loigcal topics into 109 pages very well, and as it says on the back cover 'it does not attempt to be a text-book' but rather provides a basic introduction to logic.
Any one with a difficulty, perhaps, to mathemtics and symbols might find this book slighlty challenging, but even then the symbols are explained so well it should be no problem. Besides, one cannot hope to be introduced to a technical subject, similar but not the same as mathematics, without the use of symbols.
The whole text is very thought provoking and mentally stimulating, and further questions for consideration are provided a the back, as well as a further reading list.
So, this book is a good introduction for anyone interested in formal logic, mathematics, computers etc., irrespective of previous knowledge.