Fallacies are common logical flaws that will weaken your argument's logic.Fallacies might be invalid arguments or irrelevant points and they're easy to spot because they don't have any proof to back up their claims. The existential fallacy is a type of formal fallacy.It occurs when a categorical syllogism employs two universal premises to arrive at a particular conclusion.For example, ?All household pets are domestic animals.No unicorns are domestic animals.Therefore, some unicorns are not household pets. In the above example, the fallacy is committed because we have two universal premises and a particular conclusion.Thus, the existential fallacy is committed in the above argument.Additional InformationUndistributed Middle: The undistributed middle fallacy is a formal error that occurs when a categorical syllogism's middle term is not distributed in either the minor or major premise.Affirmative conclusion from Negative Premises: When a categorical syllogism includes a positive conclusion and one or two negative premises, it commits the formal fallacy of affirmative conclusion from a negative premise.Exclusive fallacy: The exclusive premises fallacy is a syllogistic fallacy that occurs in a categorical syllogism that is erroneous since both premises are negative.