Image:Gillies postal stamp.gif
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This image is courtesy of Chris Caldwell.
Donald B. Gillies discovered 3 new mersenne primes in early 1963. When the primes were confirmed the UIUC Math dept (which has a postal branch) used this cancellation stamp on all mail from roughly 1964 - 1976, when Appel and Haken proved the 4-color theorem ("Four Colors Suffice") and a new stamp was created. Trivia question : how far away from Gillies did Appel live in Urbana Illinois ?? Answer : He lived 3 houses away.
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 05:00, 27 June 2005 | 287×94 (14 KB) | SystemBuilder (Talk | contribs) | (Donald B. Gillies discovered 3 new mersenne primes in early 1963. When the primes were confirmed the UIUC Math dept (which has a postal branch) used this cancellation stamp on all mail from roughly 1964 - 1976, when Appel and Haken proved the 4-color the) |
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