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Albert Einstein writing on a blackboard in Pasadena
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Albert Einstein writing on a blackboard in Pasadena

{{en|1=Albert Einstein writes a density formula of the Milky Way on January 14, 1931 on the board of the Carnegie Institute of the Mt. Wilson Observatory in Pasadena, California. Text for a tensor element is R_{ik} = 0 \quad ?

Date
1931-01-14
Archive
Wikimedia Commons
Type
photograph
Original size
2,294 × 3,000 pixels

Public domain

Reason: its US copyright was not renewed (published 1931–1963).

This status rests on the photo's publication history, as researched by Wikimedia Commons. Check it before commercial use.

Read from: Commons licence category: PD US not renewed; no CC BY, CC BY-SA, GFDL or deletion tag on the file page.

Credit line

"Albert Einstein writing on a blackboard in Pasadena" (1931-01-14). Wikimedia Commons. Public domain. https://commons.wikimedia.org/wiki/File:Albert_Einstein_writing_on_a_blackboard_in_Pasadena_(1931).jpg

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