After years of listening to members with widely opposing viewpoints on CR4, and hearing the arguments presented as "proof"... I thought the science of Logic would be an interesting subject. Here is a list of types of Faulty Reasoning that some of us might occasionally, inadvertently be guilty of. It comes from HCC Writer's Handbook. Chapter 18. Logical Fallacies. By Giovanna Fogli.
Types of Fallacies
Affirming the consequent: (already mentioned in our discussion of conditional syllogism, but included here as well as a very frequent kind of problematic reasoning): In an if clause the 'if' part is called 'antecedent' and the 'then' part 'consequent' - to affirm the validity/truth of the antecedent based on evidence supporting the consequent is to commit a fallacy. E.g.: "If she's an Opera Singer, she sings well. She does sing well. Therefore she is an Opera Singer." However, she might be a pop singer or not a singer at all.
Hasty generalization: faulty reasoning due to jumping to a generalized conclusion drawn with not enough necessary evidence. E.g., "Smoking is deadly. My uncle smoked and he died of lung cancer": smoking might indeed be deadly, but the death of your uncle alone is not sufficient evidence. Or, "Last year I took Logic and I got a C. So did my friend and my roommate. It is impossible to get an A in Logic!" Logic might indeed be difficult, but the fact that you and your roommate did not get an A does not make it impossible for others.
Faulty causality: (Post hoc/propter hoc "After this, therefore because of this"): a sequence of events is improperly turned into a causal chain (just because event A happens before event B, we cannot hastily infer that B happens because of A). E.g., "Protestantism is an imperialistic religion. Right after the Protestant Reformation, Europe became imperialistic."
Continue reading the list of fallacies here: https://eee.uci.edu/programs/humcore/Student/WritersHandbook/Ch18_LogicalFallacies_Fogli.html
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