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Deductive reasoning is the process of drawing valid inferences. ... Descartes' background in geometry and mathematics influenced his ideas on the truth and reasoning ...
A mathematical proof is a deductive argument for a mathematical statement, ... Pólya, G. (1954), Mathematics and Plausible Reasoning, Princeton University Press, ...
Research in mathematical logic commonly addresses the mathematical properties of formal systems of logic such as their expressive or deductive power. However, it can also include uses of logic to characterize correct mathematical reasoning or to establish foundations of mathematics.
In this case, the conclusion contradicts the deductive logic of the preceding premises, rather than deriving from it. Therefore, the argument is logically 'invalid', even though the conclusion could be considered 'true' in general terms. The premise 'All men are immortal' would likewise be deemed false outside of the framework of classical logic.
Deductive reasoning plays a central role in formal logic and mathematics. [1] In mathematics, it is used to prove mathematical theorems based on a set of premises, usually called axioms. For example, Peano arithmetic is based on a small set of axioms from which all essential properties of natural numbers can be inferred using deductive reasoning.
In practice, it is usually enough to know that we could do this. We normally use the natural-deductive form in place of the much longer axiomatic proof. First, we write a proof using a natural-deduction like method: Q 1. hypothesis Q→R 2. hypothesis; R 3. modus ponens 1,2 (Q→R)→R 4. deduction from 2 to 3; Q→((Q→R)→R) 5. deduction ...
Deductive system, deductive apparatus, or proof system, which has rules of inference that take axioms and infers theorems, both of which are part of the formal language. A formal system is said to be recursive (i.e. effective) or recursively enumerable if the set of axioms and the set of inference rules are decidable sets or semidecidable sets ...
But even arguments that are not deductively valid may still be good arguments because their premises offer non-deductive support to their conclusions. For such cases, the term ampliative or inductive reasoning is used. [63] Deductive arguments are associated with formal logic in contrast to the relation between ampliative arguments and informal ...