(July 20, 2015 at 3:22 pm)robvalue Wrote: I thought if the word. Sound. Yeah? The argument can be sound, but the conclusion may be invalid.
You might want to review your logic terms:
http://www.iep.utm.edu/val-snd/
http://philosophy.lander.edu/logic/tvs.html
A sound argument necessarily has a true conclusion. A sound argument is defined as a deductively valid argument whose premises are all true.
"A wise man ... proportions his belief to the evidence."
— David Hume, An Enquiry Concerning Human Understanding, Section X, Part I.