The Deductive reasoning reference article from the English Wikipedia on 24-Apr-2004
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Deductive reasoning

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Deductive reasoning is the process of reasoning from the general to the specific. Deductive reasoning is supported by deductive logic, for example:

From general propositions:

To specific propositions such as: In contrast to inductive reasoning, the conclusions of deductive reasoning are as valid as the initial assumption.

Deductive reasoning was first described by the ancient Greek philosophers such as Aristotle.

See also