This up-to-date introductory treatment employs category theory to explore the theory of structures. Its unique approach stresses concrete categories and presents a systematic view of factorization structures, offering a unifying perspective on earlier work and summarizing recent developments. Numerous examples, ranging from general to specific, illuminate the text. 1990 edition, updated 2004.

Cats have padded silently into our hearts, bringing with them their grace, their independence, and their essential mystery. Anyone who lives with a cat knows the strange and mysterious bond that grows between human and animal, as they make houses into homes, heal stress, and provide endless entertainment. In this exquisitely produced anthology, drawn from the writing of cat lovers through the ages, Celia Haddon offers a testimony and a tribute to that unique and rewarding relationship between humans and their feline companions in which cats, in their utmost complexity, remain among us but not of us. Above all, she reminds us of the truth of why cats matter.

Awaiting the birth of his first kittens, feline P. I. Joe Grey, his companion Dulcie, and their furry sleuthing pals must unmask a killer preying on some of the most vulnerable citizens in the charming California coastal community of Molena Point. For Joe Grey and Dulcie, life is a bittersweet mix of endings and beginnings. While they joyfully await their first litter, they are also sad for their friend, the old yellow cat Misto, whose time on earth is drawing to an end. But Misto tells them an exciting future awaits: among the litter will be a little calico returned from the distant past who will be born with the same ancient markings, and the adventurous spirit of Joe Grey. While the proud parents await the birth of their babies, their humans have their hands full with projects of their own. Kate Osborne has bought the old Pamillon estate and Ryan Flannery is building a new cat shelter as part of their volunteer rescue project. The criminals are busy, too. The Molena Point PD has stepped up patrols to apprehend a mugger attacking the local elderly. The case becomes a homicide when one of the victims dies, leaving everyone in the town—including Joe and Grey and his furry sleuthing companions—on edge, just when the kittens are about to arrive. When Dulcie gives birth, her little calico is just as Misto predicted, as if she has come back to the world from mythic ancient times. But the celebrations will have to wait. A murderer is on the loose—and neither young nor old is safe until the culprit is found.

Because her good luck cat Woogie has already used up eight of his nine lives in narrow escapes from disaster, a Native American girl worries when he disappears.

This volume contains the articles contributed to the Conference on Categorical Algebra, held June 7-12,1965, at the San Diego campus of the University of California under the sponsorship of the United States Air Force Office of Scientific Research. Of the thirty-seven mathemati cians, who were present seventeen presented their papers in the form of lectures. In addition, this volume contains papers contributed by other attending participants as well as by those who, after having planned to attend, were unable to do so. The editors hope to have achieved a representative, if incomplete, cover age of the present activities in Categorical Algebra within the United States by bringing together this group of mathematicians and by solici ting the articles contained in this volume. They also hope that these Proceedings indicate the trend of research in Categorical Algebra in this country. In conclusion, the editors wish to thank the participants and contrib. utors to these Proceedings for their continuous cooperation and encour agement. Our thanks are also due to the Springer-Verlag for publishing these Proceedings in a surprisingly short time after receiving the manu scripts.

They All Saw A Cat — New York Times bestseller and 2017 Caldecott Medal and Honor Book The cat walked through the world, with its whiskers, ears, and paws . . . In this glorious celebration of observation, curiosity, and imagination, Brendan Wenzel shows us the many lives of one cat, and how perspective shapes what we see. When you see a cat, what do you see? If you and your child liked The Girl Who Drank the Moon, Finding Winnie, and Radiant Child — you'll love They All Saw A Cat "An ingenious idea, gorgeously realized." —Shelf Awareness, starred review "Both simple and ingenious in concept, Wenzel's book feels like a game changer." —The Huffington Post

A modern introduction to the theory of structures via the language of category theory. Unique to this book is the emphasis on concrete categories. Also noteworthy is the systematic treatment of factorization structures, which gives a new, unifying perspective to earlier work and summarizes recent developments. Each categorical notion is accompanied by many examples, usually moving from special cases to more general cases. Comprises seven chapters; the first five present the basic theory, while the last two contain more recent research results in the realm of concrete categories, cartesian closed categories and quasitopoi. The prerequisite is an elementary knowledge of set theory. Contains exercises.