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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 ...
It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure of arguments alone, independent of their topic and content. Informal logic is associated with informal fallacies, critical thinking, and argumentation ...
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 ...
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.
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; T–V distinction, involving a distinction between formal and informal words for "you"
For example, as the tax authorities tend to become more informal, in contrast the social security system is reverting to using the formal form. The same forms, such as the pronoun te , are used for formal singular and for both formal and informal plural.
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.
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.