Simone Malacrida 
Introduction to Mathematical Logics [EPUB ebook] 

In this book, all facets of mathematical logic are presented such as:
symbology, principles and properties of elementary logic
boolean logic
order theory and axiomatic systems
axiomatic set theory and Godel’s theorems
logical paradoxes and logical antinomies
descriptive and fuzzy logics
number theory and modular arithmetic