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In logic, equivocation ("calling two different things by the same name") is an informal fallacy resulting from the use of a particular word or expression in multiple senses within an argument. [1] [2] It is a type of ambiguity that stems from a phrase having two or more distinct meanings, not from the grammar or structure of the sentence. [1]
In everyday reasoning, the fallacy of four terms occurs most frequently by equivocation: using the same word or phrase but with a different meaning each time, creating a fourth term even though only three distinct words are used. The resulting argument sounds like the (valid) first example above, but is in fact structured like the invalid ...
For example, oxygen is necessary for fire. But one cannot assume that everywhere there is oxygen, there is fire. A condition X is sufficient for Y if X, by itself, is enough to bring about Y. For example, riding the bus is a sufficient mode of transportation to get to work.
The following statements are examples of false equivalence: [3] "The Deepwater Horizon oil spill is no more harmful than when your neighbor drips some oil on the ground when changing his car's oil." The "false equivalence" is the comparison between things differing by many orders of magnitude: [ 3 ] Deepwater Horizon spilled 210 million US gal ...
Venn diagram for "A or B", with inclusive or (OR) Venn diagram for "A or B", with exclusive or (XOR). The fallacy lies in concluding that one disjunct must be false because the other disjunct is true; in fact they may both be true because "or" is defined inclusively rather than exclusively.
For example, Kavka states that it is wrong to deprive someone of their property, but it is right to take property back from a criminal who takes another's property in the first place. He also states that one should be careful not to use this ambiguity as an excuse to recklessly violate ethical rules.
free logic A form of logic that allows for terms that do not denote any existing object, differing from classical logic by not requiring every term to refer to something in the domain of discourse. free variable
Download QR code; Print/export Download as PDF; Printable version; ... This category is for fallacies of propositional logic, ...