Program Construction: Calculating Implementations from Specifications by Roland Backhouse [Repost]

Unique approach tackles what most books don't-why maths and logic are fundamental tools for a programmer
This comprehensive guide is a balanced combination of mathematical theory and the practice of programming
Straightforward presentation of construction principles inlcuding: assignment axiom, sequential composition, case analysis, use of invariants and bound functions
Includes a wide range of entertaining and challenging examples and exercises