Neuroscience and Critical Thinking by Albert Rutherford

Author:Albert Rutherford
Language: eng
Format: epub

Non Sequitur Logic or Invalid Logic25

Think about the logic of this statement:

All A are B.

B is A.

Therefore, C is B.

This doesn't make sense as an argument, but why? If the two premises are true, then anything A also has to be B, and anything B is A. But neither of these premises have C in them. It is impossible to argue, therefore, that C is B based on the stated premises, and the argument is invalid. This is an example of a logical fallacy, because it is not a mathematical truth derived from the logical process. There are many different types of fallacies, but this one is called a non sequitur. "Non sequitur" is Latin for "does not follow," and is exactly what it sounds like—when a conclusion is unrelated to the premises. Some of the other types of logical fallacies are explained below.

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