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In logic and mathematics, a formal proof or derivation is a finite sequence of sentences (known as well-formed formulas when relating to formal language), each of which is an axiom, an assumption, or follows from the preceding sentences in the sequence, according to the rule of inference.
The definition of a formal proof is intended to capture the concept of proofs as written in the practice of mathematics. The soundness of this definition amounts to the belief that a published proof can, in principle, be converted into a formal proof. However, outside the field of automated proof assistants, this is rarely done in practice.
Proof theory is a major branch [1] of mathematical logic and theoretical computer science within which proofs are treated as formal mathematical objects, facilitating their analysis by mathematical techniques.
The formal language of proof draws repeatedly from a small pool of ideas, many of which are invoked through various lexical shorthands in practice. aliter An obsolescent term which is used to announce to the reader an alternative method, or proof of a result.
A formal theory is an axiomatic system (usually formulated within model theory) that describes a set of sentences that is closed under logical implication. [1] A formal proof is a complete rendition of a mathematical proof within a formal system.
A formal system is an abstract structure and formalization of an axiomatic system used for deducing, using rules of inference, theorems from axioms by a set of inference rules. [1] [non-tertiary source needed] [2] In 1921, David Hilbert proposed to use formal systems as the foundation of knowledge in mathematics. [3]
The subject of logic, in particular proof theory, formalizes and studies the notion of formal proof. [8] In some areas of epistemology and theology, the notion of justification plays approximately the role of proof, [9] while in jurisprudence the corresponding term is evidence, [10] with "burden of proof" as a concept common to both philosophy ...
In mathematical logic, a theory (also called a formal theory) is a set of sentences in a formal language. In most scenarios a deductive system is first understood from context, after which an element ϕ ∈ T {\displaystyle \phi \in T} of a deductively closed theory T {\displaystyle T} is then called a theorem of the theory.