Formal proof
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, an assumption, or follows from the preceding sentences in the sequence by a rule of inference. The last sentence in the sequence is a theorem of a formal system. The notion of theorem is not in general effective, therefore there may be no method by which we can always find a proof of a given sentence or determine that none exists. The concept of natural deduction is a generalization of the concept of proof.
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Formal proof
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, an assumption, or follows from the preceding sentences in the sequence by a rule of inference. The last sentence in the sequence is a theorem of a formal system. The notion of theorem is not in general effective, therefore there may be no method by which we can always find a proof of a given sentence or determine that none exists. The concept of natural deduction is a generalization of the concept of proof.
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A formal proof or derivation i ...... upon the formal system in use.
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Em lógica, uma derivação forma ...... geralmente é bastante difícil.
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En Lógica, una derivación form ...... s) suele ser bastante difícil.
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La dimostrazione è una serie d ...... rità, un predicato, una frase.
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Onder formeel bewijs wordt in ...... nd moeilijker dan het laatste.
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Une démonstration formelle est ...... lon le système formel utilisé.
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البرهان (بالإنجليزية: Proof) ف ...... يقيم كذب القضية فيسمى تفنيداً.
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A formal proof or derivation i ...... ation of the concept of proof.
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Em lógica, uma derivação forma ...... ação do conceito de derivação.
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En Lógica, una derivación form ...... ón del concepto de derivación.
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La dimostrazione è una serie d ...... rità, un predicato, una frase.
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Onder formeel bewijs wordt in ...... steem van een formeel systeem.
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Une démonstration formelle est ...... de la notion de démonstration.
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البرهان (بالإنجليزية: Proof) ف ...... يقيم كذب القضية فيسمى تفنيداً.
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Derivação formal
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Dimostrazione
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Démonstration formelle
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Formal proof
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Formeel bewijs
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Prueba formal
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برهان فلسفي
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