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6s October 23, 1986

JOSHUA LEDERBERG

PRESIDENT

es
Professor pavid(Barnette
Department of Mathematics
University of California
Davis, California 95616

Dear Professor Barnette:

Nature (9/25/86) brought to my attention your book on...

polyhedra..., which I have been enjoying very much, and will
commend to others.

You may be interested that the chemists have finally
gone out of their way to synthesize a non-planar-graph mole-

cule (see enclosure). These instances are remarkable enough,
we can list them as odd exceptions.

The systematics of graphs is still not what I would like

it to be. We have to cheat* to accommodate the tetravalent

nodes that do crop up. But the system we have makes do, well
enough.

It was good to hear of you.

Yours sincerely,

  

joshua Lederberg)

cnet. Yu /

P.S. Biochemical combinatorics focusses these days on linear
strings but long ones like the human DNA, 3x102 units
long. There is lots to do in graph matching (under

point mutations, deletions, transpositions...) in that
sphere.

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é America:1986. Pp.l58. Hbk ISBN 6-883853094.
REE £27. 6 ve

. ov Processes; Characterization and Converg-
ence. By STEWART N. ETHIER and THOMAS G.
KURTZ. Wiley:1980. Pp.S3-4. Hbk ISBN U-47!~
O8IS6-8, FAG 10. $47.50

   
 
 

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