Logic 1.1-1.5
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Logic | show 🗑
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show | An assertion that something is (or is not)the case; all propositions are either true or false.
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Statement | show 🗑
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Simple Proposition | show 🗑
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show | A proposition containing two or more simple propositions.
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Disjunctive (Or Alternative) Proposition | show 🗑
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show | A type of compound proposition; it is false only when the antecedent is true and the consequent is false.
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Inference | show 🗑
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show | A structured group of propositions, reflecting an inference.
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Premise | show 🗑
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show | The Proposition in an argument that the other propositions, the premises, support.
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Even when premise and conclusion are united in one sentence, the conclusion of the argument may come first. | show 🗑
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Deductive Argument | show 🗑
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Inductive Argument | show 🗑
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show | the argument is invalid.
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show | A deductive argument is valid when, if its premises are true, its conclusion must be true.
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show | If all the premises are true, the conclusion must be true; applies only to deductive arguments.
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Invalid Argument | show 🗑
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show | is to discriminate valid from invalid ones.
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Classical Logic | show 🗑
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Modern Symbolic Logic | show 🗑
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Probability | show 🗑
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show | no claim of conclusiveness is made.The terms 'validity' and 'invalidity' do not apply to inductive arguments.
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Deductive Arguments Cannot Become Better or Worse | show 🗑
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show | more likely to be true than false.
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show | T
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show | rests on the nature of the claims made by the two types of arguments about the relations between their premises and their conclusions.
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show | one whose conclusion is claimed to follow from its premises with absolute necessity, this necessity not being a matter of degree and not depending in any way on whatever else may be the case.
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show | one whose conclusion is claimed to follow from its premises only with probability, this probability being a matter of degree and dependent upon what else may be the case.
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show | An attribute of a proposition that asserts what really is the case.
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show | arguments
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An argument may be valid even when its conclusion and one or more of its premises are false. | show 🗑
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The truth or falsity of an argument's conclusion does not by itself determine the validity or invalidity of the argument. The fact that an argument is valid does not guarantee the truth of the conclusion. | show 🗑
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show | T
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show | T
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show | An argument that is valid and has only true premises.
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