Peirce's 1870 “Logic Of Relatives ” • Selection 5

Post : Peirce's 1870 “Logic Of Relatives” • Selection 5
http://inquiryintoinquiry.com/2014/02/04/peirces-1870-logic-of-relatives-%e2%80%a2-selection-5/
Posted : February 4, 2014 at 9:40 am
Author : Jon Awbrey
Tags   : Peirce, Logic, Logic of Relatives, Mathematics, Relation Theory, Semiotics

On to the next part of §3. Application of the Algebraic Signs to Logic.

<quote>

The Signs for Multiplication
----------------------------

I shall adopt for the conception of multiplication the application of a relation, in such a way
that, for example, lw shall denote whatever is lover of a woman.  This notation is the same as that
used by Mr. De Morgan, although he appears not to have had multiplication in his mind.

s(m +, w) will, then, denote whatever is servant of anything of the class composed of men and women
taken together.  So that:

s(m +, w) = sm +, sw .

(l +, s)w will denote whatever is lover or servant to a woman, and:

(l +, s)w = lw +, sw .

(sl)w will denote whatever stands to a woman in the relation of servant of a lover, and:

(sl)w = s(lw) .

Thus all the absolute conditions of multiplication are satisfied.

The term “identical with ──” is a unity for this multiplication.  That is to say, if we denote
“identical with ──” by 1 we have:

x1 = x ,

whatever relative term x may be.  For what is a lover of something identical with anything, is the
same as a lover of that thing.

(Peirce, CP 3.68)

</quote>

Comments
--------

Peirce in 1870 is five years down the road from the Peirce of 1865–1866 who lectured extensively on
the role of sign relations in the logic of scientific inquiry, articulating their involvement in the
three types of inference, and inventing the concept of “information” to explain what it is that
signs convey in the process.  By this time, then, the semiotic or sign relational approach to logic
is so implicit in his way of working that he does not always take the trouble to point out its
distinctive features at each and every turn.  So let’s take a moment to draw out a few of these
characters.

Sign relations, like any brands of non-trivial 3-adic relations, can become overwhelming to think
about once the cardinality of the object, sign, and interpretant domains or the complexity of the
relation itself ascends beyond the simplest examples.  Furthermore, most of the strategies that we
would normally use to control the complexity, like neglecting one of the domains, in effect,
projecting the 3-adic sign relation onto one of its 2-adic faces, or focusing on a single ordered
triple of the form (o, s, i) at a time, can result in our receiving a distorted impression of the
sign relation’s true nature and structure.

I find that it helps me to draw, or at least to imagine drawing, diagrams of the following form,
where I can keep tabs on what’s an object, what’s a sign, and what’s an interpretant sign, for a
selected set of sign-relational triples.

Figure 1 shows how I would picture Peirce’s example of equivalent terms, v = p , where “v” denotes
the Vice-President of the United States, and “p” denotes the President of the Senate of the United
States.

LOR 1870 Figure 1
http://inquiryintoinquiry.files.wordpress.com/2014/02/lor-1870-figure-1.jpg

Depending on whether we interpret the terms “v” and “p” as applying to persons who hold these
offices at one particular time or as applying to all those persons who have held these offices over
an extended period of history, their denotations may be either singular of plural, respectively.

As a shortcut technique for indicating general denotations or plural referents, I will use the
“elliptic convention” that represents these by means of figures like “o o o” placed at the object
ends of sign relational triads.

For a more complex example, Figure 2 shows how I would picture Peirce’s example of an equivalence
between terms that comes about by applying the distributive law for relative multiplication over
absolute summation.

LOR 1870 Figure 2
http://inquiryintoinquiry.files.wordpress.com/2014/02/lor-1870-figure-2.jpg

Regards,

Jon

-- 

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