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when toggle format what by license comment
May 12, 2019 at 2:34 history edited Francois Ziegler
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May 11, 2019 at 4:12 vote accept Nick Addington
May 10, 2019 at 22:05 answer added user25309 timeline score: 16
May 10, 2019 at 20:41 comment added George C. Modoi I have no idea, but if it $A$ stands for Atiyah, then $\hat A$ should come from sir Michael Atiyah wearing a hat.
May 10, 2019 at 16:38 history asked Nick Addington CC BY-SA 4.0