> Skip to content
Penguin homepage
Books
Fiction
Action & adventure
Classics
Contemporary fiction
Crime & thrillers
Fantasy & science fiction
General & literary fiction
Graphic novels
Historical fiction
Romance
Short stories
View all fiction
Non-fiction
Art, music & photography
Biography & memoir
Business & finance
Computing & technology
Food & drink
Health & lifestyle
History
Politics & law
Society & culture
Travel
View all non-fiction
Ages
0 - 2
3 - 5
6 - 8
9 - 11
12 - 13
Young adult
View all ages
Popular links
New releases
Bestsellers
Coming soon
Our lists
Penguin Classics
Popular series
New Zealand Books
Puffin
DK
Hairy Maclary
Features
News
Extracts
Articles
Recipes
Q&A
Activities
Book clubs
Teachers' notes
View all features
Authors
Events
More
Features
News
Extracts
Articles
Recipes
Q&A
Activities
Book clubs
Teachers' notes
About
Authors
Events
Schools
View cart
2
Search books and authors
HR
Hartley Rogers
Book for an event
Books by Hartley Rogers
Theory of Recursive Functions and Effective Computability
Hartley Rogers
Read more
