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==Forms of reasoning==
[[File:Argument terminology used in logic.png|thumb|500px|right|[[Argument]] terminology used in [[logic]]]]
[[Deductive reasoning]] concerns the [[logical consequence]] of given premises. On a narrow conception of logic, logic concerns just deductive reasoning, although such a narrow conception controversially excludes most of what is called informal logic from the discipline. Other forms of reasoning are sometimes also taken to be part of logic, such as [[inductive reasoning]] and [[abductive reasoning]], which are forms of reasoning that are not purely deductive, but include [[material inference]]. Similarly, it is important to distinguish deductive validity and inductive validity (called "strength"). An inference is deductively valid [[if and only if]] there is no possible situation in which all the premises are true but the conclusion false. An inference is inductively strong if and only if its premises give some degree of probability to its conclusion.
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