The importance of the potential surface model has led naturally to a large number of studies on the subject, where the emphasis has usually been placed on lower dimensional problems, such as the reaction dynamics of diatomic to four-atom systems, or conformational problems restricted to few internal rotations. The purposes and methods of this book are, however, somewhat different from those of most studies on potential surface problems. The emphasis here is placed on those fundamental properties of potential energy hypersurfaces that are general for higher dimensions, that is, for larger molecules. The study of these properties requires some of the tools of global analysis that are not among the routine mathematical techniques of quantum chemists: topology, homotopy, and homology. This book provides the reader with an introduction to the fundamentals and to some of the more recent developments in the theory of potential energy hypersurfaces. The text is fairly self-contained. It requires no previous mathematical knowledge from the reader beyond that needed in an undergraduate quantum chemistry course.

The legendary order of mystic warrior-monks continue their battle against the forces of evil in a collection of original stories chronicling the exploits of the Knights Templar.

Following up on the successful Tales of the Knights Templar, a collection of original stories by leading fantasy authors--including Andre Norton, Diane Duane, Deborah Turner Harris, and others--continues the adventures of the legendary medieval French warrior-priests on their journey to the Holy Land. Reprint.

A collction of nine stories features the elite Knights Templar of the Holy Land and includes the writings of Katherine Kurtz, Poul Anderson, Elizabeth Moon, and Deborah Turner Harris

With Kelson Haldane, the first king of magical Deryni heritage to sit upon the throne of Gwynedd in centuries, the priesthood of the Eleven Kingdoms, old enemies of the Deryni, will do anything to regain control of the kingdom, even if it means inciting civil war, in a revised and expanded edition of the fantasy classic.

Threatened by King Kelson's trust in Duke Alaric Morgan, who boasts of his Deryni heritage, the priests of Gwynedd spread stories about Deryni atrocities and the race's inexplicable powers, in a revised and expanded edition of the second book in the Deryni series. Originally in paperback.

Charissa, a full-blooded Deryni trained in the disciplines of sorcery and necromancy, threatens the rulership of Kelson and the life of his chief advisor Morgan.

In the conclusion of the Deryni series, political power meets its match in the power of magic as the time approaches for the king's wedding

Half-blood Deryni Alaric Morgan has been pledged as a child to the service of the Haldane king and his heir, but the superstitious fears of the populace of Gwynedd, the suspicions of the Church, and the treachery of the Camberian Council could destroy his future before he ever reaches manhood. Reprint.

When a series of gruesome murders baffles European police, LAPD detective John Drummond risks his own life to stop the killers, a generation of Nazi vampires with a thirst for world domination. Reissue.

Los Angeles policeman Jack Drummond travels back to 1972, World War II, and the time of the Crusades to investigate a bizarre series of murders in which the murder weapon had been a stake through the heart. Reissue.

An A-to-Z guide to Katherine Kurtz's fictional world offers an encyclopedia to the seventeen-book saga she created, including genealogies, chronologies, and maps--all designed to introduce readers to the complexities of the Deryni universe. Original.

The first volume in a new Deryni trilogy jurneys back in time to a world ruled by a man named Donal in which the magical Deryni blood was sought by the most powerful men and women in the kingdom of Gwynedd. By the author of King Kelson's Bride. Reprint.

The legendary order of mystic warrior-monks continue their battle against the forces of evil in a collection of original stories chronicling the exploits of the Knights Templar.

The creator of the Deryni universe compiles a selection of eight short fantasy stories inspired by her own Deryni novels, in an anthology that also features a never-before-published tale by Kurtz. Original. (view table of contents)

In a novel based on the author's short story, 'The Gargoyle's Shadow,' at the turn of the millennium, the gargoyles assigned to guard the old buildings of Dublin join forces to take on an ancient evil that threatens the entire world. Reprint.

In the sequel to The Temple and the Stone, England's tyrannical Edward I and France's Philip IV have become unwitting puppets of the Order of the Black Swan, a group of evil alchemists in leauge with the devil, whose true goal is to capture the sacred relics guarded by the mystic Knights Templar. Original.

The military Order of the Knights Templar becomes embroiled in Scotland's wars of independence during the late thirteenth century as two Templars set out to restore the powers of the famed Stone of Scone and save Scotland

In his time, Sir Adam Sinclair has challenged the forces of evil and been victorious, but now an extraordinary evil born of ancient magic and twentieth-century ambition is reborn, and Adam must confront the most unthinkable crime against his kind--murder. Reprint. AB. PW.