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Archive for the ‘Logic and Critical Thinking’ Category

Fallacy of False Attribution

December 12th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Fallacy of False Attribution

classification : informal – fallacies of ambiguity – equivocation

Occurs when an advocate appeals to an irrelevant, unqualified, unidentified, biased or fabricated source in support of an argument.

Examples

“Objectivism advocates infanticide, therefore Objectivism is evil.”

Foundations

Present a false description of your adversary and then base your repudiation on that description.

Other Names

Equivocation
Fallacy of quoting out of context
Loki’s Wager
No true Scotsman
Reification
Matthew effect ( “accumulated advantage” )
Begging The Question

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Categories: Logic Fallacy

Fallacy of Inconsistency

December 12th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Fallacy of Inconsistency

classification : informal – non sequitur

Where something inconsistent, self-contradictory or self-defeating is presented.

Examples
Yogi Berra quote: “Baseball is 90 percent mental. The other half is physical.”

Foundations

Asserts more than one proposition such that the propositions cannot all be true. Arguing from inconsistent statements, or to conclusions that are inconsistent with the premises.

Other Names

tu quoque

© 2009 – 2010, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

Denying The Antecedent

December 12th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Denying The Antecedent

classification : formal – fallacy of propositional Logic

Arguments of this form do not give good reason to establish their conclusions, even if their premises are true.

Foundations

When a premise of an argument denies the truth of the antecedent of a conditional premise, then concludes by denying the truth of the conditional premises’ consequent.

Other Names

Same Category: Affirming the Consequent

© 2009 – 2010, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

Appeal To Consequences

November 29th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Appeal To Consequences (argumentum ad consequentiam)

classification : informal – appeals to motives in place of support

An argument that concludes a premise (typically a belief) to be either true or false based on whether the premise leads to desirable or undesirable consequences.

Foundations

Based on an appeal to emotion since the desirability of a consequence does not address the truth value of the premise. Moreover, in categorizing consequences as either desirable or undesirable, such arguments inherently contain subjective points of view.

Sub Fallacies

Appeal to Force
Wishful Thinking

Red Herring

© 2009 – 2010, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

Quoting Out Of Context

November 29th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Quoting Out Of Context

classification : informal – fallacies of ambiguity

To quote out of context is to remove a passage from its surrounding matter in such a way as to distort its meaning.

Foundations

It is often included with the Fallacy of Accent.  However, Aristotle’s original Fallacy of Accent referred solely to shifting the accent on syllables within words, and it has already be stretched a little to include shifting the accent between words within a sentence. To expand it further is reason the concept of “quoting out of context” gets its own section.

Fallacious quoting can take two distinct forms; Straw Man and Appeal to Authority.

© 2009, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

Fake Precision Fallacy

November 28th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Fake Precision Fallacy

classification : informal – fallacies of vagueness

Occurs when an argument treats information as more precise than it really is.

Foundations

When imprecise information contained in the premises must be taken as precise in order to adequately support the conclusion.

Examples

Other Names

Fake Precision
False Precision
Misplaced Precision
Spurious Accuracy

© 2009, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

In A Certain Respect And Simply

November 25th, 2009 Jeffrey Slee No comments

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In A Certain Respect And Simply

classification : informal – Non-sequitur

Take an attribute that is bound to a certain area and assume that it can be applied to a wider domain than was originally intended.

Foundations

When we discuss an attribute of something or somebody, we implicitly assume that there is some constraining contextual factors. When the assumption is carried too far in this context, then this fallacy is committed.

Other Names

Secundum quid et simpliciter

Note: On Sophistical Refutations – Translated by W. A. Pickard-Cambridge

© 2009, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

Affirming The Consequent

November 25th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Affirming The Consequent

classification : informal – Non-sequitur

Affirming the consequent argues backward from the truth of a conclusion to the truth of one of the propositions like this.

Foundations

Together with its similar Sub fallacy, Denying the Antecedent, instances of Affirming the Consequent are most likely to seem valid when we assume the converse of the argument’s conditional premise.

Note: On Sophistical Refutations – Translated by W. A. Pickard-Cambridge

© 2009, Logic – For the love of it. All rights reserved. GURU Consulting

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Categories: Logic Fallacy

Bulverism

November 24th, 2009 Jeffrey Slee No comments

Taxonomy – Where am I?

Bulverism

classification : informal – Non-sequitur

Rather than proving that an argument is wrong, a person instead assumes it is wrong, and then goes on to explain why the other person held that argument..

Foundations

The term “Bulverism” was coined by C. S. Lewis. Lewis wrote about this in a 1941 essay of the same name, later included in the anthology God in the Dock. It is very similar to Antony Flew’s “Subject/Motive Shift”.

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Sub fallacy level 1

November 24th, 2009 Jeffrey Slee No comments

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