Press ESC to cancel. Skip to content Home Sociology How do you determine if an argument is valid or invalid? Ben Davis June 15, How do you determine if an argument is valid or invalid? When an argument is valid and its premises are true? Can an argument be valid and unsound? What does it mean if an argument is unsound? Are all invalid arguments unsound? Why are inconsistent arguments valid?
What is an example of an invalid argument? What are the three important valid argument forms? What are some funny debate topics? Is a hotdog a sandwich debate topics? What are some good debate topics for middle school? Is cereal a soup questions? How do you prove cereal is a soup? Why is cereal not a soup? Is milk a broth? Is broth a beverage? Can you substitute broth for stock?
What broth means? Previous Article What sounds good for dinner tonight? Next Article What are the notes names? Social studies. Ben Davis January 30, Which of the following is a valid logical argument? How do you determine the validity of an argument using truth tables? Which is the best definition of validity? What is truth table with example? What is the other name of truth table? Is 0 True or false? How many lines are in a truth table?
Which Biconditional statement is true? What does a truth table show? This argument is not valid, for it is possible that the premises are true and yet the conclusion is false. Perhaps Adam loves Beth but does not want Beth to love anyone else. So Adam actually hates Cathy. The mere possibility of such a situation is enough to show that the argument is not valid.
Let us call these situations invalidating counterexamples to the argument. Basically, we are defining a valid argument as an argument with no possible invalidating counterexamples. To sharpen your skills in evaluating arguments, it is therefore important that you are able to discover and construct such examples. Notice that a counterexample need not be real in the sense of being an actual situation.
It might turn out that in fact that Adam, Beth and Cathy are members of the same family and they love each other. But the above argument is still invalid since the counterexample constructed is a possible situation, even if it is not actually real.
All that is required of a counterexample is that the situation is a coherent one in which all the premises of the argument are true and the conclusion is false. So we should remember this :. An argument can be invalid even if the conclusion and the premises are all actually true.
To give you another example, here is another invalid argument with a true premise and a true conclusion : "Paris is the capital of France. So Rome is the capital of Italy. It is not valid because it is possible for Italy to change its capital say to Milan , while Paris remains the capital of France.
Another point to remember is that it is possible for a valid argument to have a true conclusion even when all its premises are false. Here is an example :. All pigs are purple in colour. Anything that is purple is an animal.
So all pigs are animals. Before proceeding any further, please make sure you understand why these claims are true and can give examples of such cases. The concept of validity provides a more precise explication of what it is for a conclusion to follow from the premises. Since this is one of the most important concepts in this course, you should make sure you fully understand the definition. In giving our definition we are making a distinction between truth and validity.
In ordinary usage "valid" is often used interchangeably with "true" similarly with "false" and "not valid". But here validity is restricted to only arguments and not statements, and truth is a property of statements but not arguments. So never say things like "this statement is valid" or "that argument is true"! Introduction A What is an argument? The standard format A Validity A Soundness A The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. What is the meaning of "your argument is invalid"? Asked 5 years, 5 months ago. Active 2 years, 3 months ago. Viewed 7k times. Improve this question. Rathony, Doesn't it imply, "Your argument has never been invalid to the extent it is right now"?
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