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Essays have been sub-classified as formal and informal: formal essays are characterized by "serious purpose, dignity, logical organization, length," whereas the informal essay is characterized by "the personal element (self-revelation, individual tastes and experiences, confidential manner), humor, graceful style, rambling structure ...
Formal system, an abstract means of generating inferences in a formal language; Formal language, comprising the symbolic "words" or "sentences" of a formal system; Formal grammar, a grammar describing a formal language; Colloquialism, the linguistic style used for informal communication
In German, Du is only used as an informal pronoun. It is only addressed to persons that one knows well, like family members and friends. It is also most commonly used among peers as a sign of equality, especially among young people. In formal situations with strangers and acquaintances, Sie is used instead. "Ihr" was also used in formal ...
The formal style is generally used in formal writing and speech. It is, for example, the language of textbooks, of much of Kannada literature and of public speaking and debate. Novels, even popular ones, will use the literary style for all description and narration and use the colloquial form only for dialogue, if they use it at all.
A formal system (also called a logical calculus, or a logical system) consists of a formal language together with a deductive apparatus (also called a deductive system). The deductive apparatus may consist of a set of transformation rules , which may be interpreted as valid rules of inference, or a set of axioms , or have both.
By contrast, written language is typically more structured and formal. While speech and signing are transient, writing is permanent. It allows for planning, revision, and editing, which can lead to more complex sentences and a more extensive vocabulary.
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.
Advertisements, instructions and other formal messages are mostly in informal singular form (sinä and its conjugations), but the use of formal forms has increased in recent years. For example, as the tax authorities tend to become more informal, in contrast the social security system is reverting to using the formal form.