Affirming the Consequent Reasoning You See in Everyday Life


What is an example of affirming the consequent?

Affirming the consequent, sometimes called converse error, fallacy of the converse, or confusion of necessity and sufficiency, is a formal fallacy of taking a true conditional statement (e.g., “If the lamp were broken, then the room would be dark“), and invalidly inferring its converse (“The room is dark, so the lamp …

What is affirming the consequent in an argument?

Affirming the consequent is a fallacious form of reasoning in formal logic that occurs when the minor premise of a propositional syllogism affirms the consequent of a conditional statement.

How do you identify affirming the consequent?

“Affirming the Consequent” is the name of an invalid conditional argument form. You can think of it as the invalid version of modus ponens.



4. Affirming the Consequent

  1. If A then B. …
  2. If A then B. …
  3. If I have the flu then I’ll have a fever. …
  4. If there’s no gas in the car then the car won’t run.
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Which of the following is an example of a fallacy of affirming the conclusion?

a fallacy of affirming the conclusion is an incorrect reasoning in proving p → q by starting with assuming q and proving p. For example: Show that if x+y is odd, then either x or y is odd, but not both. A fallacy of affirming the conclusion argument would start with: “Assume that either x or y is odd, but not both.

What is a consequent in logic?

A consequent is the second half of a hypothetical proposition. In the standard form of such a proposition, it is the part that follows “then”. In an implication, if P implies Q, then P is called the antecedent and Q is called the consequent. In some contexts, the consequent is called the apodosis.

Does science affirm the consequent?

Science affirming the consequent



We might think that theories makes predictions. This could be thought of like a conditional, where the theory is the antecedent and the prediction is the consequent; if the theory is true, then something else should be true as well.

Is affirming the consequent a valid argument form?

Affirming the consequent is a valid argument form. An argument of this form—If p, then q; p; therefore, q—is called modus ponens. An argument of this form—If p, then q; not p; therefore, not q—is called modus tollens. This argument form known as modus tollens is valid.

Which expresses the fallacy of affirming the consequent argument form?

Quote from the video:
Youtube quote: I have the flu then I'll have a fever I do have a fever therefore. I have the flu. Here we're affirming that the consequent is true and from this inferring that the antecedent is also true.

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What is an example of denying the consequent?

For example, given the proposition If the burglars entered by the front door, then they forced the lock, it is valid to deduce from the fact that the burglars did not force the lock that they did not enter by the front door. Also called modus tollens.

What does it mean to affirm the consequent and why is it a logical fallacy?

In committing the fallacy of affirming the consequent, one makes a conditional statement, affirms the consequent, and concludes that the antecedent is true. Thus to commit the fallacy one would conclude that today is Tuesday.

What are some examples of ad hominem?

Ad Hominem Examples

  • A politician arguing that his opponent cannot possibly be a good choice for women because he has a religious conviction that causes him to be pro-life.
  • A lawyer who argues that his client should not be held responsible for theft because he is poor.

What is a fallacy example?

Example: “People have been trying for centuries to prove that God exists. But no one has yet been able to prove it. Therefore, God does not exist.” Here’s an opposing argument that commits the same fallacy: “People have been trying for years to prove that God does not exist. But no one has yet been able to prove it.

What is the importance of fallacies in our daily life?

The ability to discern a valid argument from a false one is an important skill. It’s a key aspect of critical thinking , and it can help you to avoid falling prey to fake news . If you’re taken in by a logical fallacy, false conclusions might cause you to make decisions that you later regret.

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What is fallacious reasoning?

Fallacies are errors or tricks of reasoning. We call a fallacy an error of reasoning if it occurs accidentally; we call it a trick of reasoning if a speaker or writer uses it in order to deceive or manipulate his audience. Fallacies can be either formal or informal.

How can you recognize fallacies in your daily life?

Bad proofs, wrong number of choices, or a disconnect between the proof and conclusion. To spot logical fallacies, look for bad proof, the wrong number of choices, or a disconnect between the proof and the conclusion. Identify bad proofs. A bad proof can be a false comparison.

How do you recognize and avoid fallacies?

use false, fabricated, misrepresented, distorted or irrelevant evidence to support arguments or claims. intentionally use unsupported, misleading, or illogical reasoning. represent yourself as informed or an “expert” on a subject when you are not. use irrelevant appeals to divert attention from the issue at hand.