Digital Companion to C. S. Peirce
1880 | On the Algebra of Logic | W 4:167-168; CP 3.166, 168
…a leading principle, which contains no fact not implied or observable in the premisses, is termed a logical principle, and the argument it governs is termed a complete, in contradistinction to an incomplete, argument, or enthymeme.
We may here distinguish between logical and extralogical validity; the former being that of a complete, the latter that of an incomplete argument.
‘Logical Validity’. Term in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/term/logical-validity, 26.03.2023.