The action and the effect of corresponding or corresponding they are called correspondence . To correspond, on the other hand, is to pay something with equality or belong.
The concept of correspondence can be used to name that which has proportion or relation to something else . For example: "Don't try to compare two things that have no correspondence", "The judge has analyzed the calls but found no correspondence with the defendant's sayings", “The correspondence between the statements surprised the press”.
It is known as correspondence, on the other hand, to the written communication between two or more people . Correspondence implies the exchange of letters : the person that sends the communication It is the sender, while the recipient is the recipient.
Usually, the notion of correspondence is used to name the exchange of printed letters , which move within a on . The recipient's name and address are written on the front of the envelope, while the sender's data is recorded on the back. Correspondence, however, can be the exchange of emails or emails. In this case, the communication is virtual and digital.
Correspondence is usually associated with a private exchange, where a person TO write to a person B and this one answers him. In some cases, however, the correspondence becomes public, either by the will of those involved (with an open letter) or by their fame (when the exchange of correspondence between celebrities is published).
It is important to establish that the term correspondence, having this meaning, can be classified into several groups and based on different criteria:
• If what is taken into account is its content, we can establish that it can be divided into two sets: the first class, such as postcards or letters, which is only informative and personal; and the second class, which is one that has to do with packages.
• In the event that the destination would be taken into account, we can establish that there are two types of correspondence: the private one, which addresses aspects of particular interest, and the public one, which is the one that is developed through the media of communication and that has general interest.
• On the other hand, if what we consider is the extension of the correspondence, we find that it can be long, which is the one with more than 200 words; medium, which is the one that has up to 200 words, or short, that does not exceed 100 words.
• A fourth classification of the correspondence is the one that is carried out based on its form of processing. In this case, it is determined that it can be telegraphic, which is when it is processed through telegraph offices and services; and the postcard, which is the one managed by going to the post offices. The latter in turn is divided into two: ordinary and certified, which has a higher price and requires the recipient to have to sign in order to pick it up.
In the field of mathematics, correspondence is a binary relationship between two sets . Correspondence is a subset of the Cartesian product of these sets.