• Smoke photos from early this evening in Maple Ridge. That is the sun, not the moon.
• Philosophically, I seek good sources for knowledge. I am skeptical, but open to conspiracy theories, but they are not replacement facts by default.
• Statements (conclusions), premises and conclusions (arguments) should be considered with reasonable objectivity if finding the truth is the objective.
• Validity in deductive arguments is a technical term in logic. Elements (1997: 33).
• If the premises are true, the conclusion must be true. The concept of true premises and false conclusion would be 'inconceivable in a valid argument'. Elements (1997: 33).
Validity is a set of premises supporting a conclusion. Technically in logic the premises do not have to be true, simply valid. Elements (1997: 33).
• Therefore a valid deductive argument can have:
False premises and a true conclusion (FT)
False premises and a false conclusion (FF)
True premises and a true conclusion (TT)
However
True premises and a false conclusion (TF) is invalid.
Valid arguments with all true premises are called sound arguments. These also have a true conclusion.
CONWAY DAVID A. AND RONALD MUNSON (1997) The Elements of Reasoning, Wadsworth Publishing Company, New York.
LANGER, SUSANNE K (1953)(1967) An Introduction to Symbolic Logic, Dover Publications, New York. (Philosophy).
PIRIE, MADSEN (2006)(2015) How To Win Every Argument, Bloomsbury, London.