If A then B is true, and B is true, then A is true {affirming the consequent}|, a deduction fallacy.
Arguments can assume conclusion in question without proof {begging the question}| {petitio principii}. It is a deduction fallacy and is the same as circularity. However, allowing conclusion with which no one argues is not fallacy. Proposing conclusions for argument's sake is not fallacious.
Conclusion can prove premise {circular argument} {circular reasoning}| {circularity}. It is a deduction fallacy and is the same as begging the question.
Granting permission for two things can sound like permitting first or second, like exclusive OR, but is actually conjunction {confectionary fallacy}, a deduction fallacy.
If A then B, and not A, so not B is incorrect logic {denying the antecedent}|, a deduction fallacy. If A then B, and not B, so not A is modus-tollens denying the consequent and is correct reasoning.
People can incorrectly assume that if two things are alike in some ways, they are alike in other ways {false analogy}|, a deduction fallacy.
Syllogism can incorrectly have four terms, typically because one term has two meanings {four-term fallacy}, a deduction fallacy.
A is B; C is B; so A is C is association, not deduction {guilt by association}|, a deduction fallacy.
I know who my father is. I do not know who the masked man is. My father is not the masked man {masked man fallacy}|. However, the masked man can be anybody. Sentence objects are not the same. It is a deduction fallacy.
People can make wrong implications {non sequitur}|, a deduction fallacy.
People can leave out important part {omission fallacy}, a deduction fallacy.
Overgeneralization, jumping to conclusion, stereotyping, either-or fallacy, or trivial analogies simplify argument {oversimplification}|, a deduction fallacy.
Because effect follows something, the something can be said to be cause {post hoc ergo prompter hoc} {post hoc prompter hoc}, a deduction fallacy.
In syllogism, neither premise can have distributed term, which applies to All or No {undistributed middle fallacy}|, a deduction fallacy.
Premise or definition can include the term to define {vicious circle fallacy}|, a deduction fallacy.
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Date Modified: 2022.0225