File:Ramanujan Notebook 1 Chapter 8 on 1234 series.jpg

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English: Snippet from Srinivasa Ramanujan's first notebook, chapter 8, concerning an alternate derivation of 1 + 2 + 3 + 4 + ⋯ = −1/12
Date
Source http://www.imsc.res.in/~rao/ramanujan/NoteBooks/NoteBook1/chapterVIII/page3.htm
Author Srinivasa Ramanujan (1887 – 1920)

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The author died in 1920, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.

This work is in the public domain in the United States because it meets three requirements:

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  2. it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
  3. it was in the public domain in its home country (India) on the URAA date (1 January 1996).
For background information, see the explanations on Non-U.S. copyrights.
India has 50 pma for authors dead before 1941, was PD on 1996 URAA date
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