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formal validity

См. также в других словарях:

  • formal logic — the branch of logic concerned exclusively with the principles of deductive reasoning and with the form rather than the content of propositions. [1855 60] * * * Introduction       the abstract study of propositions, statements, or assertively used …   Universalium

  • Formal proof — See also: mathematical proof, proof theory, and axiomatic system A formal proof or derivation is a finite sequence of sentences (called well formed formulas in the case of a formal language) each of which is an axiom or follows from the… …   Wikipedia

  • Validity — The term validity (also called logical truth, analytic truth, or necessary truth) as it occurs in logic refers generally to a property of particular statements and deductive arguments. Although validity and logical truth are synonymous concepts,… …   Wikipedia

  • Formal interpretation — A formal interpretation [http://books.google.com/books?id=weKqT3ka5g0C pg=PA74 lpg=PA74 dq=%22Formal+interpretation%22+%22formal+language%22 source=web ots=pLN ms7Wi2 sig=P JqwdzOqLcX4nMpP64qmacnkDU hl=en#PPA74,M1 Cann Ronnie, Formal Semantics:… …   Wikipedia

  • formal — formal1 formalness, n. /fawr meuhl/, adj. 1. being in accordance with the usual requirements, customs, etc.; conventional: to pay one s formal respects. 2. marked by form or ceremony: a formal occasion. 3. designed for wear or use at occasions or …   Universalium

  • formal — for•mal [[t]ˈfɔr məl[/t]] adj. 1) being in accordance with the usual requirements, customs, etc.; conventional: to pay one s formal respects[/ex] 2) marked by form or ceremony: a formal occasion[/ex] 3) clo designed for wear or use at elaborate… …   From formal English to slang

  • formal system — In logic, a formal language together with a deductive apparatus by which some well formed formulas can be derived from others. Each formal system has a formal language composed of primitive symbols that figure in certain rules of formation… …   Universalium

  • formal — /ˈfɔməl / (say fawmuhl) adjective 1. being in accordance with conventional requirements; conventional. 2. marked by form or ceremony: a formal occasion. 3. observant of form, as persons; ceremonious. 4. excessively ceremonious. 5. being a matter… …  

  • Formal fallacy — In philosophy, a formal fallacy or a logical fallacy is a pattern of reasoning which is always wrong. This is due to a flaw in the structure of the argument which renders the argument invalid. A formal fallacy is contrasted with an informal… …   Wikipedia

  • Formal calculation — In mathematical logic, a formal calculation is sometimes defined as a calculation which is systematic, but without a rigorous justification . This means that we are manipulating the symbols in an expression using a generic substitution, without… …   Wikipedia

  • validity — /veuh lid i tee/, n. 1. the state or quality of being valid: to question the validity of the argument. 2. legal soundness or force. [1540 50; < LL validitas, equiv. to L valid(us) VALID + itas ITY] * * * In logic, the property of an argument… …   Universalium

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