Aspects of this topic are discussed in the following places at Britannica.
...(3) The fallacy of irrelevant conclusion is committed when the conclusion changes the point that is at issue in the premises. Special cases of irrelevant conclusion are presented by the so-called fallacies of relevance. These include ( a) the argument ad hominem (speaking “against the man” rather than to the issue), in which the premises may only make a personal...
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