Some articles on valid, argument, valid argument:
... That is, the word "valid" does not refer to the truth of the premises or the conclusion, but rather to the form of the inference ... An inference can be valid even if the parts are false, and can be invalid even if the parts are true ... But a valid form with true premises will always have a true conclusion ...
... An argument is valid if and only if the truth of its premises entails the truth of its conclusion and each step, sub-argument, or logical operation in the argument is valid ... The corresponding conditional of a valid argument is a logical truth and the negation of its corresponding conditional is a contradiction ... An argument that is not valid is said to be "invalid" ...
Famous quotes containing the words argument and/or valid:
“You have such strong words at command, that they make the smallest argument seem formidable.”
—George Eliot [Mary Ann (or Marian)
“Just as soon as we notice that someone has to force himself to pay attention when dealing and talking with us, we have a valid demonstration that he does not love us or that he does not love us anymore.”
—Friedrich Nietzsche (18441900)