Validity is a way of appraising the inference from premises to conclusion soundness adds the second dimension of whether or not the premises are true in addition to the argument being valid sound = valid + true premises so, a valid argument with one or more false premises is unsound (not sound. In fact, an argument might be perfectly valid but still have a false conclusion this is where soundness comes in if an argument is sound, then all of the premises are true.
This will be because the form of the argument is flawed validity then, is all about form validity by itself isn't all we want to know about an argument though we are also interested in the 'soundness' of arguments an argument is sound if, and only if, it 1) is valid, and 2) has all true premises. If an argument is sound, then all of the premises are true if the conclusion is true and the premises are not, then the argument is unsound all sound arguments are also valid arguments.
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Best answer: your example is a categorical deductive argument that is valid, yet unsound it follows an a, a, a, a, a structure an a proposition (compared to an e, i, or o proposition) is one that affirms the universal and looks like this in notation form. An argument is called sound if and only if it is valid and all its premises are true otherwise, the argument is called unsound the following is an example of a sound argument. A valid deductive argument is an argument such that it is impossible for the premises to be true and the conclusion false the conclusion follows with strict necessity from the premises the conclusion follows with strict necessity from the premises.
The following is an example of a sound argument all mammals have lungs all rabbits are mammals therefore, all rabbits have lungs here all the premises are true and the argument is valid hence, it is a sound argument, the other hand, an argument is unsound if it is either invalid or some of its premises are false for example, no mammals have lungs. An argument that-all the premises are true-the conclusion is true-if all the premises are true then the conclusion must be true-it is impossible that all the premises of an argument are true and the conclusion is false.
Modus ponens example (unsound) valid (form) deductive argument either sound or unsound if the premises are true, conclusion must be true invalid (form) deductive argument can never be sound (regardless of true premises bc the conclusion does not follow from the premises aka incorrect form.
Deductive, valid but unsound next related topic on ring this argument is such that it is impossible for the premises to be true and at the same time the conclusion false.