Logic

Logic, in general, seems to be the science of what is universally true respecting scientific representations. In a narrow sense, logic is the science of the general...

Logic treats of signs. A sign is a third.

Logic is a critic. It distinguishes between what it approves and what it condemns. This is why it must divide propositions by dichotomy.

Logic is the science of the general necessary laws of Signs and especially of Symbols.

Logic is the theory of self-controlled, or deliberate, thought; and as such, must appeal to ethics for its principles. It also depends upon phenomenology and upon...

Robin Catalogue:
A. MS., n.p., [1905-06?], pp. 1-29, with 2 pp. of variants.
“Maiotic” method of Socrates. The Athenian Schools and the emergence of Aristotle. Why the logical...

Robin Catalogue:
A. MS., n.p., [1905-06?], pp. 1-3.
Dedekind and Benjamin Peirce on the relationship between logic and mathematics. Is logic mathematics?

Supposing […] that normative science divides into esthetics, ethics, and logic, then it is easily perceived, from my standpoint, that this division is governed by the three categories. For...

It is pretty generally admitted that logic is a normative science, that is to say, it not only lays down rules which ought to be, but need not be followed; but it is the analysis of the...

Logic is the science of the classification of arguments. Reasoning is self-controlled thought; and thus Logic is directly dependent upon Ethics, or the science of...

Robin Catalogue:
A. MS., n.p., n.d., pp. 1-13; 1-6.
Some of the ways in which CSP’s scheme differs from other schemes. CSP’s point of departure is Comte. Division of science...

Robin Catalogue:
A. MS., n.p., n.d., pp. 1-13, unfinished.
Classification of the sciences. Some of the ways in which CSP’s classification differs from Comte’s. The relationship...

Logic, – I do not mean to define, but only to characterize it, – is supposed to be a science which investigates the principles upon which we are to decide whether any given...

The ultimate purpose of the logician is to make out the theory of how knowledge is advanced.

Notations are an important aspect of modern logic. Since the time of Leibniz at least, logicians have been keenly interested in the properties of logical notations and symbolic systems. One...

Robin Catalogue:
A. MS., n.p., [c.1902], pp. 4-45, 31-42, and 8 pp. of fragments.
The nature of a sign. Propositions as the significations of signs which represent that some...

Robin Catalogue:
A. MS., 2 notebooks, G-1903-2a, pp. 2-130.
Published, in part, as 6.88-97 (pp. 8-62). Omitted: the relationship between logic and mathematics; independence of...

Robin Catalogue:
A. MS., notebook, n.p., 1903, pp. 1-28, unfinished, with two p. 19’s, both of which leave text intact.
Mathematics and logic; existential graphs introduced...

Now it may be that logic ought to be the science of Thirdness in general. But as I have studied it, it is simply the science of what must be and ought to be true...