File:Blackboard bold in print in Loomis and Sternberg (1968).jpg
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Summary[edit]
| Description | Part of a page from Loomis and Sternberg (1968), a book typeset from materials prepared by the authors from their lecture notes for Math 55. This portion shows an early printed example of "blackboard bold" style letters for R and C, in a dedicated inline typeface. Using these symbols for real and complex numbers was new at the time but is now pervasive in technical literature.
Loomis, Lynn Harold; Sternberg, Shlomo (1968). Advanced Calculus. Addison Wesley. p. 241. |
|---|---|
| Author or copyright owner |
Lynn Loomis & Shlomo Sternberg |
| Source (WP:NFCC#4) | Photograph of a book in my possession |
| Date of publication | 1968 |
| Use in article (WP:NFCC#7) | Blackboard bold |
| Purpose of use in article (WP:NFCC#8) | This is an illustrative image showing a printed book from the 1960s near the beginning of the use of 'blackboard bold' type in mathematics. |
| Not replaceable with free media because (WP:NFCC#1) |
The book from which the screenshot is taken is copyrighted and released under a free license which does not however allow non-commercial use, so creation of an image under a "freer" license is not possible. |
| Not replaceable with textual coverage because (WP:NFCC#1) |
A plain textual description does not adequately convey how these symbols were used in context in publications from 60 years ago. Any other available document published in the 1960s is also going to be copyrighted. |
| Minimal use (WP:NFCC#3) | This is just a small decontextualized snippet of a mathematical textbook notes, one part of one page. |
| Respect for commercial opportunities (WP:NFCC#2) |
The use of this snippet from a book will not impact the commercial viability of the book, which is freely provided by the author's website under a creative commons BY-NC-SA license
https://people.math.harvard.edu/~shlomo/ "These books are licensed under a Creative Commons License." (with link to CC-BY-SA-NC-2.0) |
| Other information | Creative Commons BY-NC-SA-2.0
And fair use under US copyright law in the article Blackboard bold. |
| Fair useFair use of copyrighted material in the context of Blackboard bold//en.wikipedia.org/wiki/File:Blackboard_bold_in_print_in_Loomis_and_Sternberg_(1968).jpgtrue | |
Licensing[edit]
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:15, 25 July 2023 | | 2,000 × 886 (709 KB) | Jacobolus (talk | contribs) | lighten dark blotch to the right side |
| 18:40, 25 July 2023 | No thumbnail | 2,000 × 886 (731 KB) | Jacobolus (talk | contribs) | smaller image, a bit lighter | |
| 18:24, 25 July 2023 | No thumbnail | 3,256 × 1,442 (1.57 MB) | Jacobolus (talk | contribs) | Uploading a file from a free published source using File Upload Wizard |
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