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A letter can be formal or informal, depending on its audience and purpose. Besides being a means of communication and a store of information, letter writing has played a role in the reproduction of writing as an art throughout history. [1] Letters have been sent since antiquity and are mentioned in the Iliad. [2]
Essay. An essay is, generally, a piece of writing that gives the author's own argument, but the definition is vague, overlapping with those of a letter, a paper, an article, a pamphlet, and a short story. Essays have been sub-classified as formal and informal: formal essays are characterized by "serious purpose, dignity, logical organization ...
t. e. Structure of the syntactically well-formed, although thoroughly nonsensical, English sentence, "Colorless green ideas sleep furiously" (historical example from Chomsky 1957) In logic, mathematics, computer science, and linguistics, a formal language consists of words whose letters are taken from an alphabet and are well-formed according ...
A formality, an established procedure or set of specific behaviors. Pro forma, for no purpose other than satisfying a formality. Informal activities: Informal education, education outside of a standard school setting. Informal sector, the part of an economy that is not taxed, nor monitored by any form of government.
Informal logic encompasses the principles of logic and logical thought outside of a formal setting (characterized by the usage of particular statements). However, the precise definition of "informal logic" is a matter of some dispute. [1] Ralph H. Johnson and J. Anthony Blair define informal logic as "a branch of logic whose task is to develop ...
t. e. A formal grammar describes which strings from an alphabet of a formal language are valid according to the language's syntax. A grammar does not describe the meaning of the strings or what can be done with them in whatever context—only their form. A formal grammar is defined as a set of production rules for such strings in a formal language.
In informal spoken English, plural pronouns are often used with indefinite pronoun antecedents. However, this construction is generally not considered appropriate in formal speech or writing. Informal: Somebody should let you borrow their book. Formal: Somebody should let you borrow his book. —
Informal and formal communication are used in an organization. Formal communication flows downward, horizontal and upward while informal communication is generally referred to as "the grapevine". Formal communication refers to the flow of official information through proper, predefined channels and routes.