What is the fallacy called – A occurs because B causes it then if !A means !B?

the post hoc fallacypost hoc fallacy is expressed as follows: A occurred, then B occurred. Therefore, A caused B.

What is the If Then fallacy?

Description: It is a fallacy in formal logic where in a standard if/then premise, the antecedent (what comes after the “if”) is made not true, then it is concluded that the consequent (what comes after the “then”) is not true. Logical Form: If P, then Q.

What are the 5 fallacies?

Let us consider five of the most common informal logical fallacies—arguments that may sound convincing but actually rely on a flaw in logic.

  • (1) Red Herring Fallacy. …
  • (2) Strawman Fallacy. …
  • (3) Slippery Slope Fallacy. …
  • (4) Begging the Question Fallacy. …
  • (5) Post Hoc Fallacy.

When we reason that just because B followed a A must have caused B we fall for fallacy known as?

The fallacy of reasoning that just because B followed A, A must have caused B is known as: Post hoc, ergo prompter hoc.

What are the 3 Formal fallacies?

The standard Aristotelian logical fallacies are:

  • Fallacy of four terms (Quaternio terminorum);
  • Fallacy of the undistributed middle;
  • Fallacy of illicit process of the major or the minor term;
  • Affirmative conclusion from a negative premise.

What is fallacy of Amphiboly?

The fallacy of amphiboly happens when someone uses grammar or punctuation in a way that a statement could be interpreted as having more than one meaning, so it is unclear what is really meant. Other names for the fallacy are the fallacy of ambiguity, misusing ambiguity, and the fallacy of unclearness.

What is the fallacy used in the following passage John argues?

What is the fallacy used in the following passage? “John argues that active euthanasia is sometimes morally acceptable. But we can reject out of hand anything he has to say because he’s an ultraconservative.” hasty generalization.

What is ad Verecundiam fallacy?

Argumentum ad Verecundiam fallacy (argument from inappropriate authority): an appeal to the testimony of an authority outside of the authority’s special field of expertise.

What is ad Misericordiam fallacy?

Appeal to Pity (Ad Misericordiam) Description: The argument attempts to persuade by provoking irrelevant feelings of sympathy. Examples: “You should not find the defendant guilty of murder, since it would break his poor mother’s heart to see him sent to jail.”

What is ad Ignorantiam fallacy?

Ad Ignorantiam (Appeal to Ignorance) Ad Ignorantiam (Appeal to Ignorance) Description: The argument offers lack of evidence as if it were evidence to the contrary. The argument says, “No one knows it is true; therefore it is false,” or “No one knows it is false, therefore it is true.”

What is fallacy of petitio Principii?

(4) The fallacy of circular argument, known as petitio principii (“begging the question”), occurs when the premises presume, openly or covertly, the very conclusion that is to be demonstrated (example: “Gregory always votes wisely.” “But how do you know?” “Because he always votes Libertarian.”).

What is an ad Misericordiam example?

Argumentum Ad Misericordiam (Appeal To Pity):​ appealing to a person’s unfortunate circumstance as a way of getting someone to accept a conclusion. For example, “You need to pass me in this course, since I’ll lose my scholarship if you don’t.”

What is division fallacy?

A fallacy of division is an informal fallacy that occurs when one reasons that something that is true for a whole must also be true of all or some of its parts. An example: The second grade in Jefferson elementary eats a lot of ice cream.

What is fallacy of composition and division?

The fallacy of division is similar to the fallacy of composition but in reverse. This fallacy involves someone taking an attribute of a whole or a class and assuming that it must also necessarily be true of each part or member.

What is a slippery slope fallacy?

slippery slope argument, in logic, the fallacy of arguing that a certain course of action is undesirable or that a certain proposition is implausible because it leads to an undesirable or implausible conclusion via a series of tenuously connected premises, each of which is understood to lead, causally or logically, to …

What is fallacy of ambiguity?

A fallacy of ambiguity is a flaw of logic, where the meaning of a statement is not entirely clear. This can create statements which are both compelling and incorrect, either by accident or by design. Unfortunate phrasing is often responsible for unintentional humor.

What are the five fallacies of ambiguity?


  • 1.1 Equivocation.
  • 1.2 Amphiboly.
  • 1.3 Accent.
  • 1.4 Composition.
  • 1.5 Division.
  • 1.6 Assignment.

Why is anecdotal a fallacy?

A person falls prey to the anecdotal fallacy when they choose to believe the “evidence” of an anecdote or a few anecdotes over a larger pool of scientifically valid evidence. The anecdotal fallacy occurs because our brains are fundamentally lazy. Given a choice, the brain prefers to do less work rather than more.

What is a fallacy fallacy example?

The fallacy fallacy is a fallacy that asserts that because an argument is fallacious, the conclusion of the argument is false. Examples: 1) Person A: 1) If Socrates is a man, then Socrates is mortal 2) Socrates is mortal 3) Therefore, Socrates is a man.

What is anecdotal bias?

Anecdotal evidence is often unscientific or pseudoscientific because various forms of cognitive bias may affect the collection or presentation of evidence. For instance, someone who claims to have had an encounter with a supernatural being or alien may present a very vivid story, but this is not falsifiable.