Two offprint booklets from Silberstein's collection: an unsigned copy of "On the Expanding-Universe Doctrine" by Ludwik Silberstein, from the Transactions of the Royal Society of Canada (1935), four pages, 6.5 x 9.75, bound in the original wrappers; and a signed copy of "Differential Operators Acting as Integrators" by Ludwik Silberstein, from the Philosophical Magazine (June 1940), 16 pages, 6.75 x 10, signed and inscribed on the front wrapper by Dr. Silberstein to his son, "'Integrate by differentiating.' To George, from Dad, Sept. 7—1940." In overall fine condition, with soiling to the wrappers of the signed booklet.
From the collection of physicist Ludwik Siberstein.
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