Differentiated book- It has a historical context with research of the time-This book contains a historical context, which helps us understand this literary work. We must pay special attention to those events that especially influenced the world of culture and art and also to those events that were especially reflected in literature, in the life of its writer or that affected it. There are many examples in which historical events have shaped the content and forms of literature, as well as this has often been the best testimony to the importance of certain events throughout history. This context is formed by everything that, in some way, influences the event when it happens. A fact is always tied to its time: that is, to its period.A Tangled Tale is a collection of 10 short humorous stories by Lewis Carroll (Charles Lutwidge Dodgson), published serially between April 1880 and March 1885 in The Monthly Packet magazine. Arthur B. Frost added illustrations when the series was printed in book form. The stories, or knots as Carroll calls them, present mathematical problems. In a later issue, Carroll gives the solution to a Knot and discusses the readers' responses. The mathematical interpretations of knots are not always easy. Teasing from readers who responded wrongly, giving their names, was not always well received.