هر نقشهٔ صفحه‌ای چهار رنگ‌پذیر است (ریاضیات معاصر)

In this volume, the authors present their 1972 proof of the celebrated Four Color Theorem in a detailed but self-contained exposition accessible to a general mathematical audience. An emended version of the authors' proof of the theorem, the book contains the full text of the supplements and checklists, which originally appeared on microfiche. The thiry-page introduction, intended for nonspecialists, provides some historical background of the theorem and details of the authors' proof. In addition, the authors have added an appendix which treats in much greater detail the argument for situations in which reducible configurations are immersed rather than embedded in triangulations. This result leads to a proof that four coloring can be accomplished in polynomial time

In this volume, the authors present their 1972 proof of the celebrated Four Color Theorem in a detailed but self-contained exposition accessible to a general mathematical audience. An emended version of the authors' proof of the theorem, the book contains the full text of the supplements and checklists, which originally appeared on microfiche. The thiry-page introduction, intended for nonspecialists, provides some historical background of the theorem and details of the authors' proof. In addition, the authors have added an appendix which treats in much greater detail the argument for situations in which reducible configurations are immersed rather than embedded in triangulations. This result leads to a proof that four coloring can be accomplished in polynomial time.

Oscar Wilde took London by storm with his first comedy, Lady Windermere's Fan. The combination of dazzling wit, subtle social criticism, sumptuous settings and the theme of a guilty secret proved a winner, both here and in his next three plays, A Woman of No Importance, An Ideal Husband, and his undisputed masterpiece, The Importance of Being Earnest. This volume includes all Wilde's plays from his early tragedy Vera to the controversial Salome and the little known fragments, La Sainte Courtisane and A Florentine Tragedy. The edition affords a rare chance to see Wilde's best known work in the context of his entire dramatic output, and to appreciate plays which have hitherto received scant critical attention. The critic as artist The picture of Dorian Gray Salomé The importance of being earnest De profundis Poems The selfish giant Reviews Letters Anecdotes and sayings Miscellaneous sayings.