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The Joshua Lederberg Papers

Title:
Letter from Hans Freudenthal to Joshua Lederberg Annotation pdf (107,318 Bytes) transcript of pdf
Letter from Hans Freudenthal to Joshua Lederberg
Description:
Item is handwritten.
Number of Image Pages:
1 (107,318 Bytes)
Date:
1961-02-17 (February 17, 1961)
Creator:
Freudenthal, Hans
Recipient:
Lederberg, Joshua
Rights:
Reproduced with permission of Frans van der Velden.
Relation:
Lederberg Grouping: Correspondence D
Box Number: 18
Folder Number: 111
Unique Identifier:
BBAIQH
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: Freudenthal, Hans
Transcript:
Feb. 17 -- 1961
Dear Professor Lederberg,
I am teaching this year at Yale. Your letter has been sent to this address. I have tested the system in many lectures, I asked the Auditors to guess what certain unknown symbols meant. People on a scientific level had no difficulties. I learned some improvements from individual mistakes. It is surprising that less educated people or even scholars in the humanities have the greatest trouble to [ . . . ] things.
I do not know a better way to introduce variables. Do not confuse unknowns (indicated by ?x . . . ) with variables. What you represent are, to my opinion, unknowns, which have one value only (though unknown) not variables ranging over a certain set. If, on the other hand, you mean to write 1 + a = 2 --> a =1, when the --> is omitted, you settle a syntax's which I have never admitted throughout my exposition, viz. to omit connectives thus are the most essential part of the communication.
I thank you much for your interest and your bibliographical remark.
Sincerely yours,
Hans Freudenthal
Metadata Last Modified Date:
2011-08-17
Linked Data:
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Annotation by Joshua Lederberg:
KW: Yale; LINCOS; handwritten;

teaching at Yale, is doing dome LINCOS experiments;
variables vs unknowns;


jl 12/20/98