In many fields of today s scientific research there are scholars who deal with symbolic systems such as painting, music or verbal languages. No matter what the main content of every single discipline may be, the real challenge is to build up something like a general theory for languages. It is in this context that we may place the studies of some important philosophers such as Janos S. Petofi and Nelson Goodman or in another respect Willard Orman Quine and Donald Davidson, who are taken into consideration by the author of this work. The book is organized by using an original mix of...