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The Joshua Lederberg Papers

Title:
Letter from Joshua Lederberg to S. H. Eisman Annotation pdf (47,937 Bytes) ocr (1,065 Bytes)
Letter from Joshua Lederberg to S. H. Eisman
Number of Image Pages:
1 (47,937 Bytes)
Date:
1965-04-16 (April 16, 1965)
Creator:
Lederberg, Joshua
Recipient:
Eisman, S. H.
Rights:
This item is in the public domain. It may be used without permission.
Relation:
Lederberg Grouping: Correspondence D
Box Number: 17
Folder Number: 176
Unique Identifier:
BBAIKG
Accession Number:
13
Document Type:
Letters (correspondence)
Language:
English
Format:
application/pdf
image/tif
Physical Condition:
Good
Series: Correspondence, 1935-2002
SubSeries: 1961-1978
Folder: Eisman, S. H.
Metadata Last Modified Date:
2005-08-19
Linked Data:
RDF/XML     JSON     JSON-LD     N3/Turtle     N-Triples

Annotation by Joshua Lederberg:
KW; DENDRAL; graph-theoretical centers; diameter; Polya pointed
me to Jordan,

A:
Professor Polya has called my attention to the paper by Jordan which discusses
both kinds of center of a tree. My discussions, following Henze and Blair,
have concerned his "center" (p. 187), which can be thought of as a center of
-8% and your remarks called attention to his "centre de seconde espece"
(P. 189), which divides the diameter. He also anticipates the mapping of
linear chains on single edges of a graph.
As for the utility of the diameter, I could not improve on your appraisal. It ii
conforms more closely to conventional nomenclature, but would be very difficult
to manipulate to find all the isomers of a given mass. It might play a useful
role in finding all the homologues derived from a skeleton with a given diameter.

Reference: Jordan, C. (1869). Sur les assemblages des lignes.
J. rein. angew. Math., 70:185-190.

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