Yes, it's a great example of deductive reasoning. From my logic studies ten years ago I recall that an argument is considered 'Valid' if true premises must lea

Yes, it's a great example of deductive reasoning. From my logic studies ten years ago I recall that an argument is considered 'Valid' if true premises must lead to a true conclusion (ie, no gaps in the logic); to be 'Sound', however, it must be Valid and have true premises. This seems Valid to me so far. I guess the peer review (formal and crowd-sourced) will test for Soundness.