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en.wikipedia.org/wiki/Validity

The corresponding conditional of a valid argument is a logical truth and the negation of its corresponding conditional is a contradiction. The conclusion is a logical consequence of its premises. An argument that is not valid is said to be " invalid". An example of a valid argument is given by the following well-known syllogism:.

Jun 3, 2016 ... Or to put it another way, the truth of the premises guarantees the truth of the conclusion. These are all different ways of saying the same thing. Validity is the strongest possible logical glue you can have between premises and conclusion. Here's an example of an INVALID argument: 1. All actors are robots. 2.

For either example, the logic is invalid but the premises are true. Here the conclusion is false. Invalidity is a no guarantee of a true conclusion when the premises are true. True premises can lead to either a true or a false conclusion in an invalid argument. In these examples, bad luck rather than bad logic led to the false ...

For either example, the logic is invalid and the premises are false. For the premises to be true, all of them need to be true. But, for the premises to be false, only one need be false. So, an argument with a mixture of true and false premises is still considered to be an argument with false premises--it is false that all of the ...

faculty.uncfsu.edu/jyoung/spotting_invalid_arguments.htm

How do we show that an argument is invalid? If we show that an argument is invalid, what do we do then? Remember that an argument is valid if it is impossible for the premises to be true and the conclusion false at the same time. To show that an argument is invalid, we must give an example of a possibility in which the ...

ethicalrealism.wordpress.com/2011/06/17/examples-of-valid-invalid-logical-reasoning

Jun 17, 2011 ... I have described formal logic, said a little about why it's important for proper reasoning, and described how we can prove arguments to be logically invalid through counterexamples. I will now give examples of valid and invalid logical arguments to help illustrate the difference and help us learn how to ...