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en.wikipedia.org/wiki/Validity

In logic, an argument is valid if and only if it takes a form that makes it impossible for the ... An example of a valid argument is given by the following well-known ... Therefore, the argument is logically 'invalid', even though the conclusion could ...

Jun 3, 2016 ... Validity is the strongest possible logical glue you can have between premises and conclusion. Here's an example of an INVALID argument: 1.

faculty.uncfsu.edu/jyoung/spotting_invalid_arguments.htm

To show that an argument is invalid, we must give an example of a possibility in which the premises could be true and the conclusion false at the same time.

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

Jun 17, 2011 ... I will now give examples of valid and invalid logical arguments to help illustrate the difference and help us learn how to identify the difference in ...

www.iep.utm.edu/val-snd

Otherwise, a deductive argument is said to be invalid. A deductive argument ... The example given about toasters is valid, but not sound. However, the following  ...

Conclusions deduced from a set of premises together with the premises themselves form a valid argument. Here are some common examples of valid ...

coursecontent1.honolulu.hawaii.edu/~pine/logicweb/tutorials/V-I-Arguments/V-I-Arguments.html

In judging arguments to be valid or invalid, we are interested in reasoning and not truth. ... Question: What if the conclusion of the Obama example is false?

h2g2.com/edited_entry/A821107

Nov 7, 2002 ... Valid and Invalid Arguments, from the edited h2g2, the ... In the above example, both premises are true, so the conclusion must be true as well.

www.math.fsu.edu/~wooland/argumentor/TruthTablesandArgs.html

How To Use Truth Tables to Analyze Arguments ... An argument is INVALID if and only if it is logically possible for the conclusion to be false even ... Example 1.