By the Grace of G-d7th of Teves, 5736Brooklyn, N. Y.
Prof. & Mrs. Pesach Bezalel &
Sara Rivka Rosenbloom
501 W. 120th St.
Apt. 6E
New York, N.Y. 10027
Greeting and Blessing:
First of all, I want to thank you, dear Dr. Rosenbloom, once again for your effort and attention and love which you put into the work of preparing the manuscript of my late brother of blessed memory, for publication. Although the subject matter is not directly in my field, it is quite obvious to me how much effort and devotion you have given this matter. I want to thank you also in anticipation of your continued efforts in this matter, so as to have it published in the proper manner and medium, since it is in your sphere.
I take this opportunity to acknowledge receipt of Mrs. Rosenbloom's letter of the 3rd of Teves and previous correspondence. I will remember you all in prayer for the fulfillment of your hearts' desires for good in accordance to the contents of the letter, above all for good health, physically and spiritually, and to have true Yiddish Nachas from all your children, and to receive it in happy circumstances.
The Zechus of your activities in general, and especially in behalf of those coming from behind the Iron Curtain in particular, will surely stand you and all yours in good stead.
With blessing,
M. Schneerson
P. S. As I do not know if you have retained a copy of the manuscript, I have requested to send it to you.
Notes and sources
For additional letters addressed to Dr. Pinchas Betzalel and Mrs. Sarah Rivka Rosenbloom, see letter dated 11 Shevat, 5727.
The Rebbe sent a paper about advanced mathematics and a note to Professor Rosenbloom asking if he can find someone to edit and publish it. At a subsequent Farbrengen, on Yud Shevat, 5735, the professor approached the Rebbe to discuss this. The professor told the Rebbe that it definitely has material worth publishing but it needs a bit of revision. The Rebbe then asked again if he can find someone to work on it and the professor answered that he can do it himself. The Rebbe then mentioned that it was authored by his brother, R' Yisrael Aryeh Leib (the complete encounter can be seen on Chabad.org).
The manuscript was ultimately published in the quarterly Journal of Approximation Theory under the pen name Mark Gurari with the title of The Location of Eigenvalues and Eigenvectors of Complex Matrices. See also Igros Kodesh, vol. 33, letter 12,251, where the Rebbe thanks him for working on the manuscript and requests a hundred copies of the printed version. See also letter dated 4 Iyar, 5738.
Source: Photocopy of original
Published: Stories of the Rebbe (By Yoseph Janowski, 27 Nissan, 5757).