A programming course should concentrate on a program's logical structure and design rather than on simply writing code. The functional approach to programming achieves this aim because logical concepts are evident and programs are transparent, and so can be written quickly and cleanly. In this book, the authors emphasize the notions of function and relate programming to familiar concepts from mathematics and logic. They introduce functional programming via examples but also explain what programs compute and how to reason about them. They show how the ideas can be implemented in the Caml language, a dialect of the ML family, and give examples of how complex programs from a variety of areas (such as arithmetic, tree algorithms, graph algorithms, text parsing and geometry) can be developed in close agreement with their specifications. Many exercises and examples are included throughout the book; solutions are also available. An appendix gives all the code used in the book in Standard ML.

From the Kentucky Campaign to Tullahoma, Chickamauga to Missionary Ridge, junior officer Joshua K. Callaway took part in some of the most critical campaigns of the Civil War. His twice-weekly letters home, written between April 1862 and November 1863, chronicle his gradual change from an ardent Confederate soldier to a weary veteran who longs to be at home.

Callaway was a schoolteacher, husband, and father of two when he enlisted in the 28th Alabama Infantry Regiment at the age of twenty-seven. Serving with the Army of the Tennessee, he campaigned in Mississippi, Kentucky, Tennessee, and north Georgia. Along the way this perceptive observer and gifted writer wrote a continuous narrative detailing the activities, concerns, hopes, fears, discomforts, and pleasures of a Confederate soldier in the field.

Whether writing about combat, illness, encampments, or homesickness, Callaway makes even the everyday aspects of soldiering interesting. This large collection, seventy-four letters in all, is a valuable historical reference that provides new insights into life behind the front lines of the Civil War.