Mathematical Logic presents mathematical or "symbolic" logic as a reliable tool for deductive reasoning. It trains the student in both the established "Hilbert" style of writing proofs in mathematics, as well as in the emerging "equational" style that finds fruitful application in computer science curricula, especially in the areas of software engineering and program correctness. There are extensive sets of examples, remarks, problems, references, and textual discussions that aim to help the reader understand what makes logic a powerful tool in the scheme of mathematical truths.