What is a paradox?
A paradox is the term used to define, from the logic, those conclusions that turn out to be contradictory from a set of premises considered to be valid. This term, used since antiquity, approximately from the 5th century BC, comes from the words in Greek "For" and "Doxos", which can be translated to the Spanish as "beyond the credible" altogether.
The paradoxes, by its very nature contradictory, have been since they were defined for the first time, objects of study of many experts in logic and mathematics. Many of them, after being subjected to the examination have proved to be based on false premises, turned immediately resolved the problem of the contradiction. However, there are many other cases in which paradoxes really are based on true premises, and despite keeping its contradictory nature have contributed, through their study, in evolution, for example, of mathematics.
A more explanatory, a paradox could be defined as a claim that seems to be false but is actually true. The same thing happens to the contrary; a statement that seems true but that turns out to be false. That containing all the paradoxes in common is that from a set of premises, these lead to logical contradictions, therefore it's claims of which is very difficult, and even impossible, to tell if it of something real or something false.
The paradoxes are not only present in the world of logic and mathematics, but it has throughout history have been used enough in the literature, specifically in poetry. An example of this is the poem of Jorge Tellier called "The road that rises and falls".
If the same path that climbs
is the same falling
the best thing is to look at it
still from a window.
Another area where the paradoxes, are often used corresponds to the of the disciplines contemplative and mystical, where are common to refer to the realities that transcend the material realm, where the common logical distinctions cease to be relevant; for example the concept of void, paramount in the field of Buddhism and Hinduism, includes an equivalence between the created and uncreated, the form and the formless. Something that the conceptual mind can not imagine.