[Inquiry] Re: Just In Time Logic

[Jon Awbrey]

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JITL.  Note 16

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Cf: JITL 15.  http://stderr.org/pipermail/inquiry/2003-August/000732.html
In: JITL.     http://stderr.org/pipermail/inquiry/2003-August/thread.html#712

| Chapter 11.  On Logical Breadth and Depth (cont.)
|
| Thus in considering the breadth and depth of terms
| it is desirable to make a number of distinctions.
|
| By the "informed breadth" of a term I shall mean all the
| real objects of which it is predicable with logical truth
| in the supposed state of information as our knowledge is
| never absolute but consists only of probabilities that
| all the information at hand must be taken into account
| and those things of which there is not on the whole
| reason to believe that the term is truly predicable
| are not to be reckoned as part of its breadth.
|
| If T be a term which is predicable only of S_1, S_2, and S_3
| then the S_1's, S_2's, and S_3's will constitute the informed
| breadth of T.
|
| If there be a second term T' which is predicable only of S_1 and S_2
| and if it is not known that S_3 is entirely included under S_1 and S_2
| then T is considered to have a greater informed breadth than T'.
|
| If it is known that the S_3's are not all among the S_1's and S_2's the
| excess of breadth is certain but if it is not known whether or not this
| is the case it is "doubtful".
|
| If certain S_3's are known to exist which are not known to be either
| S_1's or S_2's, T is said to have a greater actual breadth than T'
| but if all the S_3's which are known to exist are also known to
| be S_1's and S_2's though there are other S_3's which are not
| S_1 or S_2 then T is said to have greater potential breadth
| than T'.
|
| If T and T' are conceptions in different minds
| or in different states of the same mind then T
| may have a doubtful excess of breadth in one
| mind and no excess at all in the other mind.
| In that case the conception is said to be
| more extensively distinct to the latter
| mind.
|
| C.S. Peirce, 'Chronological Edition', CE 3, 99-100
|
| C.S. Peirce, "On Logical Breadth and Depth", MS 233, Spring 1873,
| Chapter 11 from ["Toward a Logic Book, 1872-1873"], pp. 14-108 in:
|'Writings of Charles S. Peirce:  A Chronological Edition, Vol. 3, 1872-1878',
| Peirce Edition Project, Indiana University Press, Bloomington, IN, 1986.

NB.  I have substituted S_1, S_2, S_3 for Peirce's S', S'', S''', respectively.

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