File:Julius Wolff, Dutch mathematician, 1882 - 1945.jpg

No higher resolution available.

Julius_Wolff,_Dutch_mathematician,_1882_-_1945.jpg ‎(334 × 442 pixels, file size: 15 KB, MIME type: image/jpeg)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

Description	Nederlands: Julius Wolff, Nederlands wiskundige 1882 - 1945. English: Julius Wolff, Dutch mathematician 1882 - 1945.
Date	before 1940 date QS:P,+1940-00-00T00:00:00Z/7,P1326,+1940-00-00T00:00:00Z/9
Source	Joodsmonument.nl Julius Wolff
Author	Unknown authorUnknown author. The website joodsmonument.nl declared in an email to the uploader of 26 June, 2019 that they display this portrait since before 2006 and have not found the copyright owner in spite of efforts. Please let the uploader know if you have information on the copyright owner and author.

Licensing

	This image (or other media file) is in the public domain* because its copyright has expired and its author is anonymous.* This applies to the European Union and those countries with a copyright term of 70 years after the work was made available to the public and the author never disclosed their identity. Important: Always mention where the image comes from, as far as possible, and make sure the author never claimed authorship.	Flag of Europe
Warning sign	Note: In Germany and possibly other countries, certain anonymous works published before July 1, 1995 are copyrighted until 70 years after the death of the author. See Übergangsrecht. Please use this template only if the author never claimed authorship or their authorship never became public in any other way. If the work is anonymous or pseudonymous (e.g., published only under a corporate or organization's name), use this template for images published more than 70 years ago. For a work made available to the public in the United Kingdom, please use Template:PD-UK-unknown instead.