Definition talk:Disk

I'd rather merge this with Definition:Closed Ball. --barto (talk) 15:18, 23 January 2017 (EST)


 * Now I think about it, I'd rather not merge it with either, because it's both. Although something needs to be done about it. --prime mover (talk) 15:20, 23 January 2017 (EST)

Ball versus disk
'''Open resp. closed (unit) ball is synonymous with open resp. closed (unit) disk'''. That is, ball=disk everywhere. The difference is usage. As far as my experience goes, ball is seen in multivariate real analysis and Banach spaces, disk in topology and differential geometry. In complex analysis, I've seen both equally often. --barto (talk) (contribs) 03:35, 16 November 2017 (EST)

Disk versus disc
A quick MO and Math.SE search tells me that "disk" is used about twice as often as "disc", but both are often seen. --barto (talk) (contribs) 03:41, 16 November 2017 (EST)